Yammy's soul suck only works on normal humans. Nagato's Gedo Mazo on the other hand took Hanzo's soul.
SSJG is a bigger power boost than SSJ4.
@Kobra678: A gigantic dog robot stepped on Mad Pierrot and he should easily be a bullet timer even if you don't believe it based off his fight with Spike, because hes way faster then red eye guy who was also a bullet timer without a doubt.
Here's the video of Asimov AKA the red eye guy you're talking about. 2:34 point blank.