No doubt, but that doesn't fit in this case. Clingan wasn't considered polished or NBA ready...by hardly anyone. He's an example of a young guy developing just fine in this system while having vets ahead of him in the rotation. So, the system (coaching and/or front office) itself isn't the problem, unless something in Clingan's collegiate experience that was missed by all the scouts somehow made him more capable of adapting.
NFL scouting is certainly a more exact science than is NBA scouting, but even they have a lot of whiffs with the 3 year requirement. At the end of the day, there's a whole lot of unknowns however you go about it.