I agree with your point on two fronts:
1) To sell out to stop Tucker is a lot tougher this year than last year - he seems (I may be wrong) to be running between the tackles more AND he is being used as a weapon in the pass game. If you try to shut him down, you are looking at stopping the inside run, the outside run and then when he lines up as a WR. It's starting to remind me of USC and Reggie Bush (I know, I know, maybe hyperbole). You can't just "stop the run/stop Tucker" regardless of Shrader. You are talking about a wholesale scheme that hits on various levels of offense. And with his vision and toughness and speed, it will still be tough to stop him.
2) Shrader/Anae/Beck/New WRs are a fully different ball game this year. And with each win, they grow with confidence. Shrader was offered by Bama, the team that is on the greatest CFB run in the history of CFB. He has immense talent that, when harnessed correctly, translates to production on the field. He has great vision, is probably too tough for his own good and while his throwing form isn't perfect (I know you can argue release point, etc), he still gets the ball where it needs to go and after those first few drops in game 1, the WRs are making catches.
Does that mean we're ready to take on UGA and Bama right now? No, of course not. But with our offense operating with the weapons and execution it has, plus our D being solid, plus our kicking game getting us points on the board relentlessly... it should mean that if we are even with a team we are facing and us not turning the ball over or committing 18 penalties, we should be able to get points up on that board.
Purdue is a good team. No doubt. They can definitely beat us. But I truly expect a win and this game being the "ok, Cuse is legit, let's pay attention" in the national media. Also, having this be the second game, not the first, after Thompson and Rhino went down is huge.