Let me make it clear that I don't put Dizzy and Clark in the same league. Dizzy is my favorite trumpet player, maybe my favorite jazz musician. I just cannot imagine that anyone would rate Terry as overrated. Diz and Miles are almost household names, but only a jazz fan would know about Terry. No way he was overrated. Basie and Ellington, who he both played for, had nothing but praise, and Ellington, in his autobiography, specifically stated that he hoped Terry would someday be recognized for his achievements.
Dennis
BTW, That's one hell of a LP/CD collection in your avatar.