The problem with that really becomes that it's basically a weaker version of Sloth, and only in the aspect of strength and maybe intellect. Why would you want basically a weaker, less viable version of something? That's my thought on the it.

I feel like having the whole "taking objects from anywhere" ability better suits greed than envy, and being able to become more similar to others fits envy better. Again, these are only my thoughts and I don't want to enforce anything since we're still only idea building, just basically listing my opinion on everything.