They already fucked up by even having Grewishka in the first place. He is just a worthless mook with a cool trick weapon and a very pale comparison to the character that we were supposed to get that being the one and only Makaku who was a legit bad ass.
Grewshiska is tied to the wack ass ova and doesn't exist in the manga. Same as dumb ass Chiren who was a pretty lousy character overall.
The main thing is with those ova additions it kinda implies that the actual main villain from the first part of Battle Angel won't even be in the movie at all. Hell they might even go full retard like the ova and make no mention of Panzer kunst or kill off Vector like they did too lol. The more I type the more I careless for the movie and the more I just want a show that is 99% faithful to the manga with the exception of the og ending that was retconned due to the second series.
Also I just love how crazy Eric is in the new series.