With cases like this, I always try to look for ways to prove the person didn't do it. I guess I'm a diehard believer in the US justice system's creed that it's up to the state to prove their case, not the defendent. When I first heard about RG and his insane story about "sitting on the toilet," I figured that he'd acted alone or he had his own accomplice that no one knows about.
If I go with Hendry's story, I'd say that RG broke in, looking for a place to sleep or waiting for Amanda to get home, since we've heard rumors that he was somehow interested in Amanda. Or, he could have known that MK would be alone because he seemed to know her boyfriend from downstairs. Since much wasn't stolen, I'm guessing he was interested in a place to sleep or in the girls.
From what I read, it appears that he staked the house out a little bit. Maybe saw no one coming or going for a while and decided to enter through that window somehow. Then, he riles through Fil's room because that's the first room he entered. Then he goes to that bathroom near Fil's room because he's gotta dump. I think THAT'S when MK might have come home (as Hendry's report theorizes) and he got surprised and didn't flush the toilet. It's possible that he could have exited the bathroom right away or he could have stayed in there for a long time, trying to figure out what to do.
We don't really know if RG has ever done this kind of crime before or sexually assaulted anyone before, do we? I read somewhere that he was a creepy lurker at clubs and bars that made women uncomfortable enough to ask management to throw him out.
Anyways, maybe the night before (again just theorizing) he saw MK at the club, tried to talk to her. Gleened some info about her, which let him know that Amanda was working the next night and MK would be with friends, then go home. She might have clued him in to what her other roommates were doing the next day, too. I'm guessing she might have talked to him a little and felt a little less guarded because her boyfriend knew him. or she could have been creeped out an avoided him at the club, which pisse him off enough to go to her house.
Anyways, I agree with the surprised MK idea. And I agree with how Hendry said it happened on the bed and she got jerked to the other side of the room during the fight. I don't think it took 3 people to do that to meredith.
I read some other hearsay about a shadowy figure that had been lurking in the garden near the cottage for a few days. And I had heard that Amanda had phone calls with RG before and after the murder. Are either of these two things backed by evidence? I read AK phone records on some website but it was never made clear that RG was one of the callers.