I think we can think with certainty that Barr is working from mountains of incriminating evidence and is collating and organizing rather than investigating.
Trump has the goods.
Everybody including the masses of the guilty know it.
“... collating and organizing rather than investigating.”
That is what makes me suspicious of lengthy investigations. We know who the players are, we know where the records are, and with computers all that is necessary is to hit a key for at least 80% of the time.