That just wasn't Kendall, dude was always over confident, and lacking self awareness, and how to connect, he couldn't connect with himself for his own family, and therefore always overestimated his position.
Watched too much of the show, this month, I started talking like uhhhhh and ok, sounding like Kendall, Roman, and Shiv at the same time
in the final board vote, he didn't have Frank at all, he kept saying"oh yeah he's in the bag for me", "were going to kill it".
he was always wrong. He wasn't an idiot, but he would not make a good leader. All his moves and impulses were wrong.
Kendall was the best of the three, for sure, or Shiv, Roman wasn't fit to do anything. No business sense at all. He could connect with people, but only a certain type.