I mean, I understand the tactical surprise, here. Having Spider-Man show up in Venom would be a lot like having That Thing That Happened In That Movie recently. I just don’t know how they’d keep it a secret for this long, is all. Or even if they’d want to. When they got Spidey for Civil War, Marvel made really, really sure that you knew about it ahead of time.
Also, there’s That Thing That Happened In That Other Movie, too. I mean, yes, obviously things will be resolved there. But trying to put Venom in the middle of the MCU’s continuity is going to be… interesting.