This is well known and studied in golf--more bend-- more separation with rotation. Then, add on top of this trying to just rotate middle out without good upper body resistance. Might work with hot metal bats, not for sweetpsot control and quickness without giving up too much power.It is a big difference in the one vs 2 plane swing.
bend over one plane works fine in golf becasue you don't have to adjust on fly.
Same thing happens in hitting.
As BBscout said, getting the marginal ones to succeed in HS is a darn good goal.
As buster said, your swing might best accomplish that in fastpitch.