Here's what the "jumping" often comes down to.
Pros or better players, particularly with the driver where distance is important and the ball is teed up (more margin for error), will jump so forcefully to create additional speed that they'll literally "jump" off the ground slightly. Because their hips are turning, and their foot has lost friction (with the ground), the foot spins out.
That can be an entirely different thing than spinning on your heel. You can spin on your heel because you've "unweighted" your foot by jumping (i.e. slightly smaller jumps than the kind in my second paragraph, i.e. no real big gaps between foot and ground, but enough to "unweight" the foot), or because you just move all of the pressure to your heel, unweight the FRONT part of your foot, and spin because your heel acts with reduced friction as a pivot point.
The latter would tend to be indicative - but not always - of a swing flaw. And it may not be a big flaw, but people who pivot hard on their front heel tend to have too much rotation prematurely in the downswing. Path tends to be INward.
When we visited Dr. Kwon (a biomechanist near Dallas, TX) he was just in the early stages of doing a trial on whether flaring the feet helps or hurts golfers. Flaring the foot helps reduce rotational torque on the knee, particularly in the follow-through, yet a lot of PGA Tour players play with very square toes.
I theorized, and Dr. Kwon liked this possibility, that players square their lead foot in to help slow their rotation during the downswing, then allow it to spin out (some even on their heels a little - as I said it's not always a swing flaw) to reduce pressure from the torque. In other words, they're trying to get the "best of both worlds:" the reduced downswing turning from having it squared in, but then releasing it and letting it turn out so as not to shred their knee during the follow-through.