As a general philosaphy I don't believe teams should get this clever...
See ball, hit ball, take walk, strike out guy, catch ball, don't walk guy,
if you are old you get worse -- if you are young you get better -- if you hit in minors you will hit in majors but not quite as much. Luck evens out.
That's all -- no need for any advanced stats if you can keep track of it all some other way -- advanced stats just make it easier to do the accounting.