The problem with prosecuting him before any others is that the prosecution would have to present evidence that may jeopardize any or all of their open investigations. From the looks of how this may shake out, McCabe may be one if the smaller fish.
McCabe was referred for prosecution for leaking during the Obama admin. Nothing coup related at all. Despite that the “Trump” DOJ have played political football with him for over a year. The bottom line is nobody in the DOJ wants to prosecute McCabe to the benefit of Trump. It’s that simple.
I’m not sure it is that simple; we have no idea what kind of discussions are taking place behind closed doors. McCabe certainly doesn’t want to be indicted, and we don’t know if he is giving up information or not.
To be clear, I have no idea (or optimism) about where this is going to end.
But as long as there is an active investigation underway, I think it’s a mistake to assume that there is a cover-up in place.