Injury or Equipment Time-out

[commish34]

If an official discovers an injured player and stops the clock, does that player have to be removed if the coach calls time-out prior to the ready-for-play being delayed for 25 seconds?

Also, if a player is to be removed for "one down," can he return if a play has occured when there is a penalty and a replay of down? Example: A4 is injured on the play and is removed for a down. When play begins it is 2nd down. At the snap A is called for a)Illeg Procedure b) holding. If the penalty is administered where the down is replayed, can A4 return for that down even though it is still 2nd down?

References...

3-5-2... A charged team time-out occurs when the ball is dead and:
b) the repair of faulty player equipment requires the assistance of a team attendant or attendants, or which, without assistance of a team attendant delays the ready-for-play signal for more than 25 seconds.

3-5-3... A single charged time-out shall not exceed one minute...

3-5-6... If repair of equipment without the assistance of a team attendant delays the ready-for-play signal for more than 25 seconds, or requires the assistance of a team attendant(s) and the players team has used all permissible time-outs, the player shall be replaced for one down.

3-5-10...A time-out occurs when:
a) An apparently injured player is discovered by the official while the ball is dead and the clock is stopped and for whom the ready-for-play signal is delayed, or for whom the clock is stopped. The player shall be replaced for at least one down, unless halftime or an overtime intermission occurs. This time-out, if not charged, is an official's time out.