Hell, I agree. I am ON RECORD as saying that physical and mental toughness, and strength, was NEVER the problem in the first place with 72, 70, or even 53. They had trouble playing the game at the D1 level.
Now, a GOOD coach might be able to raise them somewhat, but not to become an asset. A GREAT coach, like say...Matt Limegrover, might be able to turn them into assets.
And you are also correct: Not having to split the freaking atom and do mental thesis/dissertations before the snap at the line of scrimmage, like Donovan's broken rubix cube had them doing, will also help.