Whelp, while we've gotten some behavioral analysis so far, no one's done any character analysis (beyond pointing out the lack of Mjolnir, which I'll address), so I'll give my two cents about the character list.
Just to start, all of these could be actual claims, since none of them give any indication of alignment and any number of roles could have been applied to even some of the simpler ones. I know I was surprised by my role with the Infinity Gauntlet. Still, I do think this narrows down the list of suspects somewhat.
I read GP as town. He claimed a character that was almost certain to be in this game, so he would have invited a challenge if he was lying, and his role is a good fit. Needless to say, Supa is town. Wouldn't have expected to see the Gjallerhorn here (guessing Speed is a Destiny fan and liked the crossover), but he has no reason to lie about it unless he was trying to cover up for another character to challenge a claim, which it's apparent he wasn't. The Stormbreaker claim from Elm makes him a slight town read for me as well, since either that and/or Mjolnir was nearly certain to be in this thing. By the by, since Stormbreaker is here, I wouldn't be surprised if Mjolnir is not. One major Thor weapon is enough.
The rest of these range from null to slightly sus. Gungnir, Ronan's Hammer, Falcon's Wings and Cap's Shield fall into the former category. Gungnir because I can't tell how likely it would be to appear in this (it's a borderline choice for a character because it does appear in the movies and is in the hands of an important side character, but doesn't play a big role there), and Ronan's Hammer because it had such a short-lived role and wasn't particularly important. while the latter two would have had me leaning slightly town on both Danielle and warren if they had claimed early. The fact that they claimed this late means that they knew these choices were available to them, so they could easily be fake claims.
The rest are slightly sus to me, largely because they're so niche. Nick Fury's Pager is the one I buy the most of these, just because it's such a strange choice that I don't think Pie would claim it in an effort to give himself cover, but I'm still iffy about it. I'm similarly iffy on the Kimoyo Beads, but I'm slightly more sus of Water because it sounds like something that he and his partner could have come up with as a weird, niche choice. As for Redwing, it's something that appeared in the movies, but it's such a little known inclusion. It screams "safe claim" to me. So, right now, I'd say that Water and Draft seem the most sus to me, with the former showing more behavioral suspicion based on what I've been reading. However, I don't think they're on a team, so I believe at least one of these calls is wrong. Still, my vote stands for now.