Yeah, that was my first thought too, but the DH9 has a frame specific rear hub, with a oversize through axel. I know a few engineers/cnc machinists, and am considering getting a new axel machined up which includes a tapered end to fit a saint mech, but looking at the pictures of the rear end, I'm not 100% convinced it would fit. The axel looks to be furter than normal away from the mech hanger, if that makes sense.
That doesn't make sense. I'll find a picture.