Type of offense versus roster
Excellent thread premise...I think a large part of our offensive struggle this year was due in part to how our receivers were put together to be successful in our old offense. In the last few Brees years, our offense consisted of a ton of < 5 yd patterns...4 yard outs, fast slants, HB swings and screens, and a lot of "find a spot in the short zone"s. We had WRs that catered to Drews limitations but who couldn't take advantage of what a QB like Winston brought to the table.
Because this limited route tree, we found we had no need for speed receivers so our WRs got bigger and slower with an emphasis on being able to catch a ball in traffic. With Winston, we tried to open things back up and found that our WR group couldn't get the job done.