Jairus
Author of FFVII: Lifestream & FFVII: Reflections
Found something else that points to Jessie's survival. In Chapter 13, we see and help rescue a woman buried in rubble and debris from the plate. She's still alive after she's pulled out. Now, think about this in terms of Jessie and the sight of her glove in the ending. What we saw in Chapter 13 proves that not only were there were survivors amidst the rubble, but that they were found buried under fragments and pieces much bigger than what Jessie was buried under in the tower. So, if they could survive the collapse and the explosions that went with it, so could Jessie. She might've been found in much the same way as the woman in Chapter 13, and like her, could have still been alive (even if only just barely) when she was.