When he apologizes to the King family regarding Fisher-Moore College, then I would might consider him sincere. He needs to connect the fundamental issues with Jorge to all the NO popes to come to the correct conclusion. Same path Louie Verrechio took.
Most forum members here are probably not familiar with, or have forgotten about the Fisher-Moore College issue, in which Marshall did something completely underhanded.
That being said, if sedes think that Marshall will be an asset as a potential sede, then they are not seeing reality. But that's not unusual for sedes.