Of course you wouldn't TEACH it (did I say that? I don't think so.) But don't try to change a guy if he's comfortable (and doing well.) Too many coaches try to put everyone in one "box." Grip and stance are the two most over-coached aspects of hitting (IMO.)
BTW- a lot depends on whether you're talking about the top or bottom hand- many power hitters grip with the top hand back in the palm but at the base of the fingers with the bottom hand.
This song is traditionally sung during the 7th inning stretch?
All My Roudy Friends
Take Me Out to the Ballgame
I Wish I was in Dixie
Hail to the Chief