Time-out, 4 return, when can 5th return?

[tjones1]

My point is how do we know until the 5th returns that all of them didn't return at the same time? There is nothing that prevents a team from playing with 4 players provided there isn't an available sub. Also, there isn't anything that prevents a team to return to 5 players if a player becomes available. If a player isn't available it's not up to us to question as to why they aren't available.... am I spinning or do you see what I'm getting at?