Original geschrieben von: Lou_Para
Maybe everyone thought of Mike as just the successor to Vito,and not Don material. He came up as sort of a mascot to the Family until the Solozzo murder. His ruthlessness and attitude after that set him apart from Vito in the eyes of the others. He was
obeyed,but not respected. In the one scene where he is called Don
Corleone,it's a drunken Pentangeli,and it comes off as condescending.

Clemenza kisses his hand and calls him Don Corleone. After the well organised massacre and the killing of Tessio and Carlo, he was respected by the others.