I'm pretty certain Q is clear about what's going to happen, the civilian justice system is going to fail but then Trump is going to have the military finish the job. Q has always been about the military, barr is just a distraction and the final piece to show how badly our justice system failed. Think about the Trump calm before the storm comments, who was he surrounded by? Generals.
I don't have specific Q posts off the top of be head to point to but I'm getting a strong feeling that what will happen is the DOJ refuses to do it's job and then Trump will involve the military to do what they wouldn't. Trump is going to take all the blame / attention from this and do what barr wouldn't with he help of the military.
Least plausible. The military will never get involved. You will lose 90% of the populous support if they do. Barr is going to let us down and we are all getting fucked because everyone would rather larp and meme than do something of substance.