Terrible example. I am from Iowa so I was well aware of the elite athleticism Kittle possessed for the TE position, despite his limited production. Dalton Keene is not that type of athlete.
To counter your point...I am optimistic with Asiasi. In the limited video there is on him, you see him constantly beating defenders in man coverage, and it looks fairly easy to him. Contrast that with the limited video on Keene. You simply don't see DK doing that. He'll sneak out into the flat, find a soft spot in a zone or he'll be completely left alone. He seems like a high effort guy, but a very limited player.