Sprite disappearing when playing and fixed path finding for tower defense games

Basically I am trying to make my gameObjects follow a fixed path in my tower defense game:

My idea is that I can create an array of invisible waypoint that will be attached to a single gameobject which the units can follow:

This is my hierachy view: link text

These are my inspector views (3 images): link text

I have attached the "Pathing" script to the "Path 1" gameobject which includes all my waypoints:

 public class Pathing : MonoBehaviour {
     public Transform[] path;
 
 
     // Use this for initialization
     void Start () {
     }
     
     // Update is called once per frame
     void Update () {
     
     }
 
     public Transform[] getPath(){
         return path;
 }
 }

I have attached the "PathFollower" script to my unit which will follow the waypoint:

 public class Pathfollower : MonoBehaviour {
  
     public int currentPoint=0;
     public Transform[] path;
     public Pathing other;
     public float speed=50.0f;
     // Use this for initialization
 
 
     void Start () {
         path=other.getPath();
     }
     
     // Update is called once per frame
     void Update () {
         Debug.Log(currentPoint);
     float dist =Vector3.Distance (path[currentPoint].position, transform.position);
     transform.position=Vector3.MoveTowards(transform.position,path[currentPoint].position,speed*Time.deltaTime);
 
         if(dist==0f){
             currentPoint++;
         }
     
         if(currentPoint>=path.Length){
             Debug.Log("reset");
             currentPoint=0;
         }
 
     }
 }

However, when I play the scene, this happens: link text

Questions:

1) Why did my unit disappear halfway?

2) Are there any more efficient ways to implement fixed path finding?

Thanks for any help rendered.