I think it is an overstatement to say Ljinders bombed. He finished third in the league and was unbeaten at home the entire time of his period in charge. He lost a game in the play offs which would have had his team promoted. It's clear he didn't have time in 6 months to impose his philosophy, which is very much the same counter-pressing philosophy of Klopp. Apparently, his team, already several months into a season in which they played a different way, didn't adapt to the changes as well as they might have. This was his first ever role as number 1, and I don't accept he made a hash of it. New managers need to learn their trade.
I agree, the game is littered with great number twos who didn't translate, but some of the best exceptions happened right here.