I'm certain that in the case of a massive battery out gassing, the plastic end cap would come off of the aluminum cap well before the aluminum case would explode.
yes it would and that would open up two larger holes in the end cap.
Maybe it would. Maybe it wouldn't.
I know that mine Won't. Because the Plastic end piece on my LT Fell Off on about the 2nd day of use. So it had to be Glued back on.