Unity3D UNet manual serialization of NetworkBehaviour

using UnityEngine;
using UnityEngine.Networking;
using System.Collections.Generic;

public class NewNetworkBehaviour : NetworkBehaviour
{
    static Dictionary<NetworkInstanceId, NetworkBehaviour> instanceIdToBehavior = new Dictionary<NetworkInstanceId, NetworkBehaviour>();
    public static T GetBehavior<T>(NetworkInstanceId netId) where T : NetworkBehaviour
    {
        return instanceIdToBehavior[netId] as T;
    }
    internal void Start()
    {
        instanceIdToBehavior[this.netId] = this;
    }
}

public class Player : NewNetworkBehaviour
{
    List<Player> suboridnates = new List<Player>();

    internal void Start()
    {
        base.Start();
    }

    // so to be able to add subordinate to any player from any client we have to do this
    public void AddSubordinate(Player subordinate)
    {
        Cmd_AddSubordinate(this.netId, subordinate.netId);
    }

    [Command]
    void Cmd_AddSubordinate(NetworkInstanceId target, NetworkInstanceId subordinate)
    {
        GetBehavior<Player>(target).Rpc_AddSubordinate(subordinate);
    }

    [ClientRpc]
    void Rpc_AddSubordinate(NetworkInstanceId subordinate)
    {
        suboridnates.Add(GetBehavior<Player>(subordinate));
    }

}