Yes, when they arrived... but it has been a long time now, and he has proven he is not up to the task, so they need to appoint a new commander. Shoot, they could have someone brain swap with him for most of the day and issue orders. That would actually be a GOOD use of the stones.
Young didn't know who was gating to Destiny. There was a chance that SGC successfully took over the planet and are sending supplies.
If Young was truly worried about Rush, he probably wouldn't have nearly suffocated him to death (while Telford was in his body) now would he? Taking that into account, there's no reason why his character shouldn't have ordered the gate room ventilated before the Lucian Alliance came through.
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