I don't know if good MR/AMR/ML/AML can really ensure team success. But I think these players are always among the best performers in my teams.

Both my teams have 2 AML and 2 AMR who are at least 4 star quality. Even if some of them are obviously the lowest quality player in the team, they have good, stable performances after adapting to my teams.

Hope I have not incorrectly interpreted your sentence as there are many words in forms I am very unfamiliar with.