because he wants to use the gears characters too and he can.it also gives him characters with out a head or torso thats why is so important.
He's referring to the split screen mode in the Playstation 3 version. Currently there is no way for a 2nd player to either a) use a PSN login or b) have a "guest" save slot. Besides that (and I guess without that) the 2nd player can not pick who they will be, create a character, or have their controller configurations saved (even between rounds). It looks like it's been mentioned a couple times, but make your voice heard. Check these threads: