IN OT...specifically the 30 sec. sudden-death. A is on top/bottom doesn't matter. B takes his 2nd IT. is A allowed to choose neutral. if so, how is the winner decided if no points are scored after that???? or say A took bottom and was rode out( he looses eventhough he may have been on top to start the SD?)

There is OT and there is the tie-breaker.
OT is 1-minute from neutral and the first score wins.
Tie-breaker is 30-seconds from the referee's position and the first score wins. In the event there is no score, the wrestler in the offensive position wins.

For a 2nd Inj timeout in OT, the wrestler has choice of: top, bottom, neutral.
For the 2nd Inj timeout in the tie-breaker the wrestler has choice of top or bottom. There is no neutral option in tie-breaker. The options available at the start of tie-breaker are: top, bottom or defer.

The wrestler in the offensive (top) position wins if there is no score during the tie-breaker. Even if there was a change of places due to a 2nd Inj. timeout.
A is on top and 25 seconds are used. A asks for his 2nd Inj. timeout of the match. B can choose top and if he stays there the remaining 5 seconds, B wins.

The second injury timeout rule does NOT apply to either the overtime or the tiebreaker portions of a match.

Fallcaller-
Please re-read your rulebook.
Injury timeout provisions carry throughout the match.
OT & Tie-breaker are extension of the match and all penalities, timeouts, etc..,carry through.
The 2nd injury timeout does apply in OT & the tie-breaker.