The prosecution of Donald Trump is going to be very easy, because of a very recent revelation: Cassidy Hutchinson and several other witnesses have testified to the Jan 6th committee about witness intimidation they suffered. That is a very important aspect of the Obstruction charge, because witness tampering shows "mens rea". (literal translation: guilty mind)

Most of the other crimes Trump et al can be charged with require criminal intent, and witness tampering does that in spades. It's just about as good as trying to have a witness killed before the trial. And it has the added benefit that the witness can appear in court to testify about it, which is difficult if they are dead. In particular, this tampering of Ms. Hutchinson was delivered by the lawyer Trump paid to defend her, so it's especially heinous: He will be disbarred and go to prison for years. His sentence will only be reduced if he names Trump, Meadows, etc. as his coconspirators. Like 5 years instead of 10. Strong motivation.