Waste of time to do anything on the Logan Act. John Kerry is a POS, for that, there is no doubt.
I think Barr should be pursuing the indictment of all involved in the coup effort against Trump, and that may well involve Kerry. He was there at the end of the Obama Administration, and there is no telling who was involved in the decision to pull off this coup.
I think if he was one of the perps, he along with the rest should be indicted on sedition and treason, and face only the maximum sentence for both crimes. Unless we execute these perps, this crap will happen again.
My biggest fear is that some of the same perps are out there right now conspiring a bloody coup. Trump's decision not to fully pursue HR Clinton for her crimes was a huge mistake that will carry through everything. He could not have made a bigger mistake, along with failing to terminate Comey day one.