The recent flurry of warrants related to Slayer boy's communications methods tends to make me believe that LE has information to definitely believe he had help of some kind and they are looking for that individual. Once that individual is found there is a possibiliy of more information, even the potential of a witness against Slayer boy. This seems desirable for the prosecution if LE can find the person.
From the physical evidence I believe the DA can place Slayer boy there and they can place a murder weapon in his hand provided the sheetrock removed from the home which yielded a print, which was analyzed and matched Slayer boy's DNA, also yields a blood spatter pattern to verify the murderer placed his hand there during the murder and the blood is indeed Michelle's.
If there is a reason to believe someone else was there, it seems reasonable to also think that at some point Slayer boy would have some communication with that person. Why not proceed investigating until such person is found to insure that justice is truly served? Sooner or later Slayer boy will do the perp walk in nice shiney cuffs and orange and white stripes.
For some reason, the obscene and foul mouthed, nefarious, 'mountain sil ' comes to mind here for me. He seems the perfect candidate as an accomplice/helper. And there are a couple of others as well. I bet LE has taken more than one look at at him/them. JMHO.