I don't think you understand that figure of speech..
anyway--it certainly was not the new OC that put a fork in Diggs--the player was taking himself out when he was displeased (with Josh Allen of all people!!). What other, "to a large extent" are responsible for his decline? They should be easy for you to name since you seem convinced.
the bulk of coverage? both in week 14 and the playoffs v. KC, he whined about them doubling as an excuse for his crappy performance. yet after each game, the Chiefs D were quick to comment that they weren't even doubling him up.
give us your "stone facts"