I tend to believe Ron didn't "do it" himself. I just think he knew what happened and didn't want it to come out.
But as a sleuthing exercise, as we are meant to do here, I'd say:
IF Ron did it, and IF the others haven't squealed on him, I can think of three big reasons for their silence:
1. Squealing on Ron would mean admitting to aiding and abetting.
It now appears that at least Tommy has admitted to that much, so why would he not squeal on Ron, IF Ron did it?
2. Only Misty knows what actually happened. (IF Ron did it, I would fully expect him to leave for work as an alibi and tell her not to tell anyone who helped hide things what actually happened. He may have instructed her to warn them not to ask questions for their own sakes, or threatened to expose them for something else.)
3. I would definitely fear his revenge. From all I've read, I believe Ron has a reputation for having dangerous friends and maybe family, some in and out of jail. My biggest fear about going to jail or prison would be of being shanked under just such a scenario.
I would not feel safe from revenge, anywhere.