User blog comment:Godisme/The Shooting Star Project (Zero Mix)/@comment-5695542-20121128232809/@comment-4431351-20121129092344

Grimmjow being kept out by Orihime and Chad is just manga logic. Like when a character is punched in the face, he's complaining it hurts, but when he is slashed a number of times, he isn't complaining at all. It's just one of the small gags that you see in almost every manga.

For Grimmjow's sword: all sealed zanpaktō are black with a white edge. The anime just coloured them full white, probably for budgetcosts.