I honestly don't think anyone is overlooking Brycen. But it's becoming increasingly obvious that Harris has an exceptional skillset, the kind most HC only dream of a TE having. He will be on par with guys like Graham and Kelce IMO.
... I see Harris being the #2 TE this year simply because they can play him out of the slot. His length and speed are a mismatch for any DB or LB they want to put on him. Once he's established as the TE threat he can be, it will allow McVay to play Tutu out of the slot. Facing that kind of speed no defense will match up. Teams might have one CB with that kind of speed but most will be forced to play zone. That will make Stafford's reads simple. Once the ball is snapped he will know immediately what version he's facing and who is likely to be open.
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This is not going to be the Ram team the NFCW expects...
I foresee McVay doubling down on speed at every opportunity, including unexpected formations such as you suggest with Harris and Atwell on the field together.
McVay didn't trade for Stafford just to run last year's stuck in the mud possession offense. McVay is impatient in a good way, he will want it all NOW.
Of course Kupp, Woods, and now Jefferson will rotate for the most overall snaps. They will also be much more effective playing on a stretched field.
McVay will accordingly make every possible use of his new speed players, obviously DJax, but including Harris and Atwell.
As much and as soon as the rookies can handle. In as many different formations and combinations as McVay can think of.