I have seriously considered that possibility, especially in light of the timing of the incident. Ron and Misty were fighting on the night of August 5/6, and she called Tommy and said she didn't want to be with Ron any longer, which prompted the Croslins to drive over to 2nd and Oak where the brawl ensued. Ron was wild that night, and Tommy wasn't letting down. (In the incident report, the officer notes Hank, Sr. told him Ron "went crazy on his son".) I think that during one of the phone calls between Misty and Tommy when she was angry with Ron, Misty told Tommy something about Ron, something that Tommy later blurted out to Ron during the fight. BUT, that doesn't necessarily mean it was a comment related to Haleigh. It might've had to do with some other illegal activity, drugs or guns. I dunno...just speculatin'. But it adds up because just two days later, on August 8th, Ron and Misty placed the headless rat in Tommy's mailbox.
Some time afterward Misty wrote a letter to LE describing the events the night of the fight and filed a petition for an injunction. On September 9th she was granted a restraining order against Tommy.
On August 25th, Detective Ken Taylor paid a visit to M. Martin after he received "a tip" that Mr. Martin might've been the victim of a theft from his home. Martin tells Taylor the senior Croslins had returned the gun, and he doesn't want to press charges. Then for some reason he has a change of heart, and on Sept. 11th decides that he does want to press charges, after all. On September 14th, Tommy was arrested. That's just too many coincidences for me.
Last fall was a crucial point in time, imo. The calendar from Aug-Oct, 2009 is full of events related to this case. When one focuses on them side-by-side, the story really does start to unfold.