Switching between three characters while the others remain visible?

Hello, I'm sure this question has been asked before in some way, shape, or form, but I'm playing around with a game idea that has three separate characters that I wish to switch between, sort of like in Trine 2 except instead of disappearing upon the player control being disabled, I later hope to implement an AI script where they'll follow along with the character who's controlled by the player. The characters are three girls: Kat, Ozzie, and Shez. They all have separate behaviors (e.g., one girl exclusively can swim, another exclusively can jump very high, etc.), so it's important that they remain distinct. I'm playing around with the script from this video: http://www.youtube.com/watch?v=Xnyb2f6Qqzg. I added the "character switch" part of the script to the update function of that script. So far I only have Kat and Ozzie as sprites and gameobjects, but I've included Shez's "button". I used the key "O" to swich to Ozzie, "K" to switch to Kat, and "S" to switch to Shez. I modified the Update() function where I try to switch characters by enabling and disabling their respective "Controller" scripts.

 using UnityEngine;
 using System.Collections;
 
 public class OzzieController : MonoBehaviour {
 
     public float maxSpeed = 10f;
     bool facingRight = true;
 
     Animator anim;
 
     bool grounded = false; 
     public Transform groundCheck;
     float groundRadius =  0.2f;
     public LayerMask whatIsGround;
     public float jumpForce = 700f;
     // Use this for initialization
     void Start () {
         anim = GetComponent<Animator>();
     
     }
     
     // Update is called once per frame
     void FixedUpdate () {
 
         grounded = Physics2D.OverlapCircle (groundCheck.position, groundRadius, whatIsGround);
         anim.SetBool ("Ground", grounded);
         anim.SetFloat("vSpeed", rigidbody2D.velocity.y);
 
         float move = Input.GetAxis ("Horizontal");
         anim.SetFloat ("Speed", Mathf.Abs (move ));
 
         rigidbody2D.velocity = new Vector2 (move * maxSpeed, rigidbody2D.velocity.y);
 
         if (move > 0 && !facingRight)
                         Flip ();
                 else if (move < 0 && facingRight)
                         Flip ();
     }
 
     void Update()
         {
         if(grounded && Input.GetKeyDown(KeyCode.Space))
         {
            anim.SetBool("Ground", false);
            rigidbody2D.AddForce(new Vector2(0, jumpForce));
 
         }
         GetComponent<OzzieController>().enabled = true;
         if(Input.GetKeyDown(KeyCode.K)) 
         {
         GetComponent<OzzieController>().enabled = false;
         }
         else if(Input.GetKeyDown(KeyCode.S))
         {
         GetComponent<OzzieController>().enabled = false;
         }
         else if(Input.GetKeyDown(KeyCode.O)){
             GetComponent<OzzieController>().enabled = true;
         }
         else
             GetComponent<OzzieController>().enabled = true;
         }
 
     void Flip()
     {
         facingRight = !facingRight;
         Vector3 theScale = transform.localScale;
         theScale.x *= -1;
         transform.localScale = theScale;
     }
 }

Kat's code is identical except for the difference:

 GetComponent<KatController>().enabled = false;
         if(Input.GetKeyDown(KeyCode.K)) 
         {
             GetComponent<KatController>().enabled = true;
         }
         else if(Input.GetKeyDown(KeyCode.S))
         {
             GetComponent<KatController>().enabled = false;
         }
         else if(Input.GetKeyDown(KeyCode.O)){
             GetComponent<KatController>().enabled = false;
         }
         else
             GetComponent<KatController>().enabled = false;
         }

Right now, when I play the game, Ozzie is automatically selected and active. I'm able to move her fine, while Kat stands still. I intend for her to be the default character selected so I'm happy with her selection state being defaulted to "true". When I press "O", which is her switch button, she's still selected. However, if I press "K" or "S", she's disabled. My problem is, pressing "K" doesn't seem to enable Kat. If I press "K", they both remain still and I can't control either of them, nor does pressing "O" again cause Ozzie to be enabled again.

Here's a screenshot of the animator:

There are no animations yet, as the sprites are still single images, but I took this from the tutorial in which it transitions from the idle to run animation if the speed parameter exceeds 0.01 and vise versa. Both game objects of Kat and Ozzie are on the "player" layer that I made, and each have an empty "groundCheck" game object as a child, also on the player layer. Everything /but/ the player layer is considered "ground" under the "whatIsGround" element. Basically, as the tutorial explained, if the character is on the ground (Ground = true), it plays the idle and run animations, but from any state they can jump or fall while ground = false (and it plays the jump animation).

I added this just in case it might be what's interfering with not being able to control them the way I want, rather than just bad scripting.

Thoughts on what I'm doing wrong?

P.S. I'm simply experimenting right now and I realize this is probably not the most efficient way to achieve switching characters by button-press, and I haven't even implemented the camera work yet. Of course I have this grandiose idea for a game that it's my dream to complete, but I'm trying to take little steps and just see what Unity can do first.