Well, as long as his mind works he can just imagine himself being back together so. The skull has to be cracked or his mind has to be broken for Zaraki to win.
Awesome that he can finally hide his Reiatsu now. I wonder if it's cause his Shikai of his own real power.
I don't completely get the last page tho... Yachiru is back to normal, but she is still in a shock? That means...Zaraki has to fight 1 on 1 till Yachiru is snapped out of her shock and can fight. Then Zaraki will distract Guremi and Yachiru will strike him from behind.