Why would he not stretch again. I am sure they all stretch. Just wild speculation.
It's not just stretching. Jog, stretch, jog faster, stretch again, .... sprint, stretch again. And so on. A proper routine is not easily done in the locker room, and it take a good amount of time done properly. According to Gio, they got around 15 minutes notice before the start of the game.
Of course it's speculation; I wouldn't call it WILD speculation. All I'm saying is that you cannot write off the possibility that that was a factor.