I'm thinking that Gray Hughes didn't get the bathroom scene from thin air. I suspect there was some kind of blood evidence in there ( I always have but had nothing to back it up). And a missing towel would fit the "cleanup" re-frame and carrying something in his arms.
Just as a thought, if you (the generic you) feared someone might have called 911, would you be more concerned with them finding you in the house with bloody coveralls on, or finding you outside next to your car trying to get out of them? At what point during the whole debacle is it safer to leave a possible blood trail out the door, or to wrap up your blood trail into a towel, maybe, if you have another something under the kill suit to keep your DNA off everything? Leave the mask on, of course, because hair. I'm just really torn on the standing outside in full view of anyone driving by at 4-4:30 am trying to strip off a bloody kill suit while not getting any cast off on yourself, your car, the ground. If a person double suited to allow removal of the outside suit in preparation, removing it inside would be faster and less observable. But yes, maybe more prone to leaving evidence behind, unless they thought it was mitigated with second suit. I am going to be on the fence on this one. Happens to me a lot.
Edited to fix the fact that I can't get Hugh and Gray in the right order.
BK could have worn a full kill suit underneath the first, and doubled (or more) the gloves and balaclava.
It seems plausible to me that he would clean up a bit, at least, before leaving Xana’s room since Dylan would have seen blood all over his face.
And I still like the idea floated a while back and again recently that BK wrapped his knife in a towel since he didn’t have the sheath, making Dylan think he was holding a small vacuum cleaner.
Anyway, a missing towel in the bathroom and blood around the sink at least would explain the defense statement that the perpetrators tried to clean up the scene.
If BK indeed removed an outer kill suit inside the house, he could have stuffed it into a waterproof rucksack on his back so he couldn’t drip blood everywhere. He wouldn’t have wrapped up the knife in the kill suit before stuffing it since he might have cut himself while doing so, plus he would have no way to defend himself.
And for anyone who thinks BK wouldn’t have time to do all this, simulate the scene yourself.
When the PCA first came out, I remember thinking (along with many people, I’m sure) that it would be impossible for one person to kill four people in 20 minutes, let alone less than 10.
I had the house layout memorized, so I walked around my house like an idiot, pretending to exit my car, walk down an incline, enter the house, creep upstairs, stab two beautiful humans, walk back down the stairs and across the living room, stab two more beautiful humans, walk across the living room again with a light source blinding me to Dylan’s presence, walk out the door, run up the incline, get out of my kill suit as if I were exiting the isolation room of a person infected with a deadly, contagious disease, close up the garbage bag and put into the trunk of my car, then enter my car. I was stunned how little time it took. My time inside the imagined murder house never exceeded three minutes.
IMOO