I agree. He needs to get the WRs and starting OL figured out so they can hit the ground running offensively. At this point that depth chart 1 through 6 is really very much TBD.
Starting OL is the 2nd priority. I have that behind WR because they at least know their LT, LG and C. But my guess is the situation at RG and RT doesn't take too long to settle. By the time they've played two preseason games they will know if Robinson can handle RT or not (my guess is not).
At TE they already know it's Higbee and Everett (plus Hemingway). Just a matter of figuring out personnel and play calling situations with them.