Ahh, thanks.
Thought it was a misspelling of Myrrah and that we were gonna end up with two gears characters, which would have been overkill.
Not understanding the displeasure for the guest characters though. It's been pretty clear since KI's launch that it doesn't exactly have a world class budget, so guest characters make perfect sense.
1. You don't have to take as much time creating from scratch, which is alot of work from what I've learned from labzeros work on Skullgirls.
2. Marketing. For example, killer instinct was on the front page of R/halo the day arbiter was shown off, and I'm sure quite a few people with no interest in the game now are watching, which imo is only a positive thing for a fighting game community.
3. Allows the devs to work on stuff I would guess is more important, the team at IG isn't exactly huge and so far we have reworked lighting on all stages, new moves and balance changes for all characters, new UI, and what looks like a completely new mode. This goes with 1 kinda, though.