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

[bob jenkins]

Originally Posted by tjones1

I know this probably shouldn't happen if we are all counting before making the ball live; however...

Following a time-out, only 4 players from Team A return. The ball becomes live. According to 10.1.9, if the 5th player returns Team A is charged with a Team Technical Foul for failing to have all players return to the court at approximately the same time following a time-out or intermission.

Here's the question:

When can the 5th player legally return without penalty?

The 5th player returns during the T.