Short version is harbaugh walked in entitled to the spot, was arrogant, is hard to work with (Leber when we were going to sign him said the exact opposite in that everyone he talked to said how he’ll wow you in interviews), and that he threw a fit when he had to complete a full interview day. It’s just another frustration when you’re looking for real sports takes and it’s all unimaginative garbage
To be fair Leber explained that as he never liked the idea of hiring him but couldn't exactly rip him before the interview since he was going to have deal with him if he was the head coach and that would be problematic. (a couple others said something similar) He said that while he did talk to players who liked Harbaugh he also talked to plenty of people who did not like the hire who knew Harbaugh from before.
In reality he should have just said nothing because he was painting himself into a corner either way.