Just think about it. What if Vulture had been maintained as the second vilain. No more symbiote. No more black suit. No more dancing Peter Parker. No More Eddie 'Eric Forman goes crazy' Brock. No more Venom. No more Gwen Stacy. The plot would have been much more fluid. Adrian Toomes would have been there at the beginning. He would have been Flint Makor's cellmate. The rest of the movie would have focused on the confrontation between Spider-Man and Sandman, and the personnal issues of Peter Parker (love triangle). And then, after being defeated by Spider-Man, Sandman would have gone to prison to free Adrian Toomes (he uses a set of wings that he built with objects find in prison to escape). The two vilains would have teamed up to complicate the task of Spider-Man in the third act. What do you think? Would that have made a better film?