Well, I just don't see it. Porter is too tough & too aggressive for his own good, IMO. And Spence is a freight train.Easily, I think Porter has a very strong chin, and he'll need to make it rough as shit like he did with Thurman. If he comes like he did against Ugas, he'll very likely end up getting himself stopped.
For me it just depends Porter shows up, the Porter from the Thurman fight will get stopped from walking into too many counters but against Ugas and Garcia Porter was very patient he would lose a wide UDHas Spence put anyone away who was elite level? Kell Brook was damaged goods after the GGG fight, so ignoring that stoppage, he has only put away B level fighters. Even Mikey Garcia, who was moving up, was never stopped by Spence. I can't see Spence stopping Porter, but I also think Porter can another his own work enough for him to get caught with something he shouldn't.