I think 1 pop of OD is worth about 2 pops in passing. And 1 pop in OD is worth 3 pops in Driving or Handling.
So given a players skills, you could use that exchange rate to see what he could have been.
For example:
A player with OD: 10, Driving: 11, Handling: 11, Passing: 7
I think a better player would be something with the following:
OD: 11, Driving:7, Handling: 9, Passing: 9
Agree?