I can understand going for someone like Otton over Likely for the blocking. I think I have posted several times that Otton would be my second choice behind Likely and that's really the big factor. I personally think Likely would be a good enough blocker and give you more as a receiver when given the chance to be the TE1 but I do understand the team's thinking there.
They have 3 big needs IMO - edge, tight end, guard. If they think they can fill the edge need in the draft, and sign Otton to fill the tight end need, I can get behind that - but they really should be signing a guard too. The currently rostered players won't cut it, and I'm not sure I want them starting another rookie next to Campbell.