I ended up thinking about Brian a bit while working, more specifically about whether his extra harsh behavior (which seems to oscillate a bit?) could be directly caused by his new power. It doesn’t have to be, but it’s to possible to not consider. It wouldn’t be the first time a power fucked with its wielder’s personality.
I don’t think this following idea is particularly likely, but here’s a thing that did occur to me: What if he doesn’t just borrow bits of powers, but also personalities? What if a bit of Crawler and Othala got stuck in him when he healed himself and the rest?
Again, fairly unlikely based on what we’ve seen, but theoretically something that could happen with a power like this.