You have a skewed and one sided outlook at what a power forward should be. I'll make it simple for you: That is not how John Beilein plays, even in his days at West Virginia. We got beat up inside these past 2 years because we had a 6'6" 200 lb. guy at the 4 in Irvin. If you don't remember, with that "terrible 4" Robinson we were the national runner up and inches away from another final 4. He was 6'7" 215. If that worked out as poorly as you say it did we wouldn't have made it close to that far. Sure, he was at a strength disadvantage down low, but he had a huge advantage in speed, quickness, shooting, and general athleticism. THAT'S HOW A STRETCH 4 WORKS. THAT'S WHAT BEILEIN'S SYSTEM REQUIRES. Before that we had Novak, and we even did well with him at the 4. Do you remember the Maryland and Purdue home games last year where Irvin forced both to play small ball because he kept blowing past their "big bad traditional power forwards"?
Here's all I can say: The 4 in John Beilein's offense is a wing. The exact same thing as a 3 but on the other side. Our current targets at the 4 reflect that by either being good shooters or being able to get in the lane IN ADDITION TO being able to rebound and bang down low. Now we haven't had a player like that under Beilein. As you've mentioned, we've had guys who would be small forwards on other teams. But it's a complete non sequitur to say that means we should just stop recruiting them altogether. Beilein is not going to completely switch his offensive philosophy that he's had for 30 years because by a recruiting fluke all his 4's turned out bad and he had to stick a 3 there. But that. Is not. What this. Is about. I don't know if you purposely put out this huge red herring, but this is about your random desire to have four centers on the chance that all of the current ones are bad and for sure give up another position of actual need. I'm going to quote myself on why that is a (sorry) bad viewpoint.
Hell, I know I can't prove my point any more than I already have, but you literally just have to look 60 miles down the road. Look at how much the Pistons improved when they got rid of Greg Monroe and put a worse player in his place in Ersan. They went from a bottom dweller to a fringe playoff team. And THEN, look how they did when they replaced a traditional stretch 4 with a large small forward in Tobias Harris, a move that pretty much equals GR3 at the 4 when the average weights and heights of college vs. pros is taken into account. They went from a fringe playoff team to a team that would've been on pace to win 56 games that year.