Agree. I like Harmon I don't want to see him go. The dude makes plays. Period.
He plays CF perfectly for this team. Single high, split coverage, blitzing, etc. Doesn't matter. He allows DMC and the CBs to play sticky coverage. He is one of the reasons the NEP were so good at defending the deep ball.
However....
If they think Jason Mc, DMC or JJ can rotate in and occasionally play Harmon's position, that allows them to keep Crossen (if he made the 2nd year jump and think he has more room to grow) or see the D playing even more man coverage and use the aforementioned at FS then that would be the scenario in which Harmon is traded. Plus they would save ~$7m over the next 2 years but being exposed defensively would be dumb.
As of right now I do not support trading him. Too many questions and hes very good at his job