I don't like this plan at all.
Mills could be used as a Cooley type, but I don't really know how much he'd add to our offense. I still don't have D'Brick as my top OLineman that I'd like to get and I would rather get Mario Williams to anchor our DL and then get Eric Winston at #20 in this case. Ko Simpson should be a good player, but I think we can find better value than him at #20 if we end up there. I would much rather come away from the top of the draft with Mario Williams and Eric Winston than D'Brickashaw Ferguson and Ko Simpson.
For offensive players that you are considering for the draft, look at the Broncos offense over the last 11 years and think, "How does this player fit into that offense and would he be a valuable addition to it?" since Kubiak ran that offense the last 11 years (which FYI was the #1 rushing offense, #1 overall offense in yards gained, and #1 offense in TDs scored over those 11 years) and as head coach and offensive playcaller here, I'm sure he will run the same system and hopefully duplicate their success.