I like the idea of Universal Grades.
Although I probably like it for other reasons.
Here's my deal. Some guys are just on another level, defying Physics. Take Randy Moss. He was 6'4", 210 Pounds and ran a 4.25 40... which blows the 'smaller guys are faster' thing out of the water, since he was one of the fastest players in the History of the NFL at 210 Pounds and 6'4". He was faster than Travis Benjamin, who is a short and light weight shrimp who runs a Sub 4.4.
Now, should EVERYONE be Randy Moss? Of course not. But a 6'4" 240 TE IF he has 100/100 on SPD and ACC SHOULD be able to be one of the fastest players in the game.
Which might lead one to suggest not so many TEs have 100/100... that should be a really rare TE, ESPECIALLY if he has any value Blocking or Catching.
For that matter, the guy is 6'4" and 240... with 100/100 on SPD/ACC he would have potential at OLB or DE (as a 43 Pass Rusher), or due to his incredible speed at FS... IF he has the other skills to justify it (TKL, Pass Rush, for FS the Coverages, etc.).
So it would be a process of figuring out his Strengths, to see if you have a Sterling Sharpe at TE, or if you have a Randy Moss at WR, or maybe you have a project who is a Big RB (Christian Okoye) or maybe even a Defender.
But it would make sense because putting him some place where his Abilities **** only gives you a sucky fast dude. If he can't Tackle, he's going to fail at DE. If he can't cover, he's not going to be a FS. If he doesn't have Ball Carrying, he's not going to be a RB. If he can't catch, he's not going to be a WR. If he can't block... well, most wouldn't use him at TE.
Height/Weight should not be the end all of Speed/Strength ranges, because despite Physics that isn't how it really works. You have different kinds of Fast Guys. And Weight doesn't equal Functional Strength.
So if we had Universal Ratings we could have more flexibility in putting a guy in a position he actual fits BECAUSE of his Ability.