@SonNeko: That's not really true. Hollows and Arrancar can interface with souls by default because they are souls to begin with, but we remove invisibilityreiatsu crush automatically. I can halfway see potentially wanting to nerf that too but but when it's the only way he can kill Logan then we can't limit him to that extent.
Even all this aside, the BFR option remains.
@SonNeko: He ate them like food because they were already spirits to begin with. It's not like a human where you can just remove the soul then eat it. They already are souls so he ate them normally. You see the same with Grimmjow eating his own fraccion in his past. It was the same. As Logan is Human, his death would be more akin to Gonzui. Grimmjow wont have to consume his body.
@taichokage: I believe Caja Negacion works only on Arrancars, otherwise why wouldn't the Espadas use them on reapers?
That aside, I agree with you, there's just so many way for Grimmjow to knock out Wolverine, doubt he can kill him tough.
Eat his soul? He is a hollow. That's his lunch everyday.
As for Caja Negacion, it wasn't explicitly said to only work on hollows iirc, but it was said that it wouldn't work on Espada tier beings, which should encompass Captain shinigami as well.
I guess everyone forgot that Wolverine has no chance.
1. This is the level of power he's up against
And surly you remember Grimmjow's sole purpose of existing correct? The consumption of souls for which adamantium bones and regeneration are worth jack.
Plus if all else failed, he can used Caja Negacion or a Garganta and Banish Logan forever.
Whether by death, knockout or BFR, Grimmjow has it in the bag.
I would think Deathstroke or Chief. I don't know chief well though. I never played Halo despite how it's always in our face.
Even given the extreme difficulty in defeating Logan through physical combat, it isn't an issue for Grimmjow who eats souls for a living.
Just taking into account his physical prowess and ignoring the fact that Grimmjow is a hollow, he's leaps and bounds beyond Logan in physical might and Logan could only at best, survive the traumatic experiences Grimmjow would subject him too. He's even capable of BFR. There's no way Logan can win this.