I'll say I disagree that Ferg is below ave talent. I think he can do it all, if he's given the chance. If you want a purely pass catching TE like Shultz was than so be it, but then why let him and Jarwin before him (after they paid him) both walk out the door if that's what they want at TE?
They aren't going to try and replace his production with another TE. They are going to shift that production elsewhere, i.e. more quick hitters to the WRs and also the RBs taking far more passes than we're used to seeing. That's what the West Coast offense does. The TE is sprinkled in to keep the defenses honest about covering the entire field and that's about it.