On the note of Bone Grill, dude ran no underwear in Requiem. Guy was free balling cleaning skulls. Just one of those things in the BTS photos you never notice until someone points it out. They made that man a new belt buckle and then never bothered to give him pants. If Neca did Bone Grill I can imagine a scenario where they combine Bone Grill and Bull into one Predator due to Bone Grill's exposure and not being able to see Bull clearly from the waist up.
The benefit of that however is that they'd have a reason to make new Wolf parts given Bull's usage of Wolf's gun and gauntlets. Maybe even reuse the boots.