Overall is HEAVILY influenced by Durability and Health(and Stamina for pitchers).
I may not be explaining this properly. Say you use 65 as your low point for VR. That guy will be a servicable BL player if he's 50 in con/pow/vl/eye. He won't be great but he'll hold his own.
Now, use 50 as you low point for VR. 50 across the board isn't going to be much at the BL level. But, give him 70 con/pow/eye and you'll have a similar guy to example one.
It works that way with most of the ratings. Except very low or very high numbers.
Hardball Dynasty – Fantasy Baseball Sim Games - Player Profile: Cecil Lazzeri is a good example. Low contact(won't hit for average), high power/eye(will hit homers and walk) and average RH split. He's going to be inconsistent because his contact is low and his combined splits are below BL average. If his OPS is .803, I can work with him despite the 0-14 streaks. If it's .602, he's useless.