It can't be a lot, or a guy like Ertz wouldn't be available every off season. I'm just not sure how good of a blocker Engram is honestly compared to other NFL TE's.
The perceived added value per target from him vs someone like Will D is minuscule compared to his AAV and what they will lose in their preferred TE attributes haha
It fits the need for a reliable pass catcher (if anyone reading this brings up "drops" that was a thing from 4 years ago, get over it. Engram already has), but Harbaugh seems to look for blocking to be a major component as well, and that's not Engram's strong suit.
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Engram would eat in that offense.