You're putting way too much stock in the Scorpio and seem to be forgetting the last four years of Sony holiday delays. I think it's pretty safe to say at this point that Sony aren't going to sacrifice the quality of their games just to compete in the most crowded season of the year, especially this year of all years and against a company they're beating 2:1. They have marketing deals with RDR2, Destiny 2, Battlefront 2 and CoD WWII, they don't need a ton of exclusives.
Seems like you're arguing with yourself with this sentence TBH. If Spider-Man has huge brand recognition, why would they care about releasing it off the back of the movie? The Arkham games certainly didn't need Batman movies to do well, Spider-Man won't either.
I think people are putting way too much stock in scorpio as well. I have no doubts it'll be a fantastic piece of hardware, but some seem to think it's going to explode at launch and start outselling the cheaper alternatives.