We should not use ten hang performance at United to judge him because the fact is that United as a team is lacking in quality which has affected them greatly any coach coming to united will always struggle because the structure to succeed is not there when ten hang was at Ajax we saw what he did so I think that he is going to succeed at Leverkusen
Eredivisie is lower than English Premier League and we cannot compare them. I mean most good coaches could lift the title with the top team of that league especially if that team is dominating it.
In English Premier League, nothing is guaranteed even for the best coach in the world training the best team in EPL.
Ten Hag had his best moments, he saved Manchester United at some point from a catastrophic failure, yet he wasn't able to fix the team correctly. The courage to get ride of some known and useless players was present but it was late. I blamed him for thinking particular point.