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The TE's coach firing is mildly surprising given the success that Njoku had this year.

I think Njoku's success is directly tied to his opportunities.

He had 123 targets this year compared to 80 last year compared to 53 the year before. His talent was always there and people saw it in his first two seasons in the NFL when he was being targeted 74 times on average. I don't think Njoku's success is directly tied to his coach (although it could be) but, IMO more about his increased role (finally) at getting the rock.