1. Benicio del Toro neither looks nor acts anything like the canonical Collector.
2. The Collector would be a very extraneous character to include in a story that seems to be about the Guardians of the Galaxy being on the run from cops and criminals trying to nab something valuable they have in their possession. Maybe "The Collector" wants it, too; but the canonical Collector is more of a kidnapper than a thief. He steals people, not objects.
3. How *the* hell could you possibly franchise an incredibly obscure and typically generic "Neutral Alien Elder With Godlike Powers" into Hollywood popcorn fare, with sequels and spinoffs already lined up?
4. It's Benicio Del Toro, one of Hollywood's perennial Oscar-baiters. They're gonna get
him to play
him....?
5. Thanos has still not been cast, nor announced. Yet Jim Starlin said he's in the movie. All hints point towards him being in the movie. How could Thanos *not* be in a movie that features (potentially) so many characters whose very existence is predicated on Thanos? Drax, Gamora, Adam Warlock, Nebula, Moondragon, Mar-Vell....Do you think they've got someone *even bigger* than Glenn Close, Benicio del Toro, John C. Reilly or Zoe Saldana waiting in the wings to nail the final "OMG HOLY ****



" casting trophy?