Problem with platformer game

I have a group of objects ( each object has Boxcollider2D ) with 1 leaders I have the Platform ( Platform offers Boxcollider2D each ) located in two different layer I want my group when running on a platform of layer 1 can jump onto the platform of layer 2 I checked the location of the platform under layer 2 ( if it is smaller than the position of my leader , the Box Collider is enabled , even if smaller , the disabled )
But the problem is that only leaders can jump onto the platform of layer 2 remaining members of the group were stranded because of the platform BoxCollider layer 2 has been enabled
How can i Fix that??

//My Platform of layer 2 script

 public class PlatformLayer2 : MonoBehaviour
 {
     public GameObject target;
     BoxCollider2D box;
     // Use this for initialization
     void Awake ()
     {
         target = GameObject.Find ("ground0");
         box = this.gameObject.GetComponent<BoxCollider2D> ();
     }
     void Start ()
     {
     
     }
     
     // Update is called once per frame
     void Update ()
     {
 
         target = GameObject.Find ("ground0");
         if (target != null) {
             if (transform.position.y < target.transform.position.y) {
                 box.enabled = true; 
             }
             if (transform.position.y >= target.transform.position.y)
                 box.enabled = false;
         }
     }
 }

//my ground with 1 leader script

 public class Mygroup : MonoBehaviour
 {
     public float time;
     public float jump;
     public bool grounded;
     public GameObject target;
     public string targetName;
     public Transform ground;
     public bool isDie, jumping;
 
     public float speed;
     Animator anim;
     // Use this for initialization
     void Awake ()
     {
         isDie = false;
     }
     void Start ()
     {
         Debug.Log ("Da tim thay target" + targetName);
         target = GameObject.Find (targetName);
         anim = GetComponent<Animator> ();
     }
     void FixedUpdate ()
     {
         if (this.gameObject.name == "P0") {
             targetName = "";
             Transform g = this.gameObject.transform.FindChild ("ground");
             if (g != null)
                 g.gameObject.name = "ground0";
         } else if (this.gameObject.name == "P1")
             targetName = "P0";
         else if (this.gameObject.name == "P2")
             targetName = "P1";
         else if (this.gameObject.name == "P3")
             targetName = "P2";
         else if (this.gameObject.name == "P4")
             targetName = "P3";
         else if (this.gameObject.name == "P5")
             targetName = "P4";
         else if (this.gameObject.name == "P6")
             targetName = "P5";
         else if (this.gameObject.name == "P7")
             targetName = "P6";
         else if (this.gameObject.name == "P8")
             targetName = "P7";
         else if (this.gameObject.name == "P9")
             targetName = "P8";
         else if (this.gameObject.name == "P10")
             targetName = "P9";
         else if (this.gameObject.name == "P11")
             targetName = "P10";
         
         target = GameObject.Find (targetName);
     }
     // Update is called once per frame
     void Update ()
     {
     
         Physics2D.IgnoreLayerCollision (9, 9);
         float dir = new float ();
         if (target != null)
             dir = target.transform.position.x - gameObject.transform.position.x;
         
         if (dir > 0.5f && grounded) {
             gameObject.transform.Translate (Vector2.right * speed);
         }
 
         grounded = Physics2D.Linecast (transform.position, ground.position, 1 << LayerMask.NameToLayer ("ground"));
         if (grounded) {
             jumping = false;
         }
         if (Input.GetMouseButtonDown (0) && gameObject.name == "P0" && grounded) {
             jumping = true;
             rigidbody2D.velocity = new Vector3 (0, 50 * jump, 0);
         }
         if (target != null && grounded && target.GetComponent<Mygroup> ().jumping && dir <= 2f) {
     
             StartCoroutine (Jump ());
         }
 
         anim.SetBool ("run", grounded);
 
     }
     IEnumerator Jump ()
     {
         yield return new WaitForSeconds (time);
         jumping = true;
         rigidbody2D.velocity = new Vector3 (0, 50 * jump, 0);
     }
 }