Why OT and WR? I think we're set there and should only pick one if it's a BPA pick. TE I'm more amenable to prioritizing over the others you mention.
Lockett only has two years left on his contract and Eskridge's time is short and no guarantee he makes the final roster this year. Plus, this is a deep WR draft where a quality WR can be had in the mid rounds to develop when Lockett eventually moves on.
Offensive tackle becomes important if Lucas' has chronic injury issues that worsen and having a tackle in the wings to develop becomes important. Fant is a good stop gap but the team may need to have a plan in case Lucas's chronic injury history worsens or flares up.