Hehe, yes, yet another What If topic!😆
I just finished rereading Eclipse, and I had an epiphany! What if Victoria/Riley wasn't gone?? As we all know, the only way to kill a vampire is to behead, dismember, and then burn it. But did you notice how Edward specifically mentioned to Seth to get 'all the pieces'?
So getting to my theory - what if they didn't get all the pieces? What happens then? Would there be a chance that Victoria/Riley could somehow come back in Breaking Dawn? I'm not exactly an expert on vampire mechanics, but here's just my random thoughts I had while reading that part!😳