[iiNzTicTx]

Are you checking if the player slot is used?

I haven't read your code thoroughly and am on mobile but it should be something like

For(new I = 0; I < [max players in zombies]; I++)
{
If (!Player[I])
{
...set your textdraw string here for the players name.
}
}

Note replaced Player1. .. Player2... so on with an array: Player