The competition will drive better production for the job and both he and Jefferson will benefit. I don't think Skow threatens Jefferson enough but Tutu has the kind of talent that can make him afraid for his job which is the best motivation if he's a competitor. The thought of him running crossers and posts with Stafford back there should terrify defenses.
Kupp > Robinson > Jefferson/Atwell > Skow > Powell. That's what I am hoping it boils down to. If Atwell can win the WR3 role even better. Harris will need to make the roster as a TE or otherwise beat out the final TE as a WR/TE hybrid so same same.