I always wondered about Gabriel having regeneration. He/she shrugged off a torso exiting bullet wound and once Maddie locked him up she didn't seem the least inconvenienced about it, and every time Gabriel manifests it's by ripping her scalp and skull open, which we know from the pillow scene makes her bleed, but only temporarily.
In any case I wouldn't put Gabriel as weakest. He'd dance around the bear and carve it up.