Keith play better than he did? God, that would have been scary!
FWIW I wasn't calling you out or anything, just curious why you found that to be true for yourself.
I used to play with a tight loop bridge because the little red Mosconi book said you had to. A few years ago when I got back into the game I re-examined my bridge and found that, even with a tight bridge, there was still plenty of shaft wiggle possible. I started to look at the players I admired most to see what they were doing that prevented that. It came down to the shape and orientation of the bridge fingers themselves.
I saw that as long as the shaft rode along some sort of a strict groove inside the loop, there was no need for the fingers to be tight on the shaft. It took awhile, but I transformed my bridge into a more relaxed bridge (not sloppy loose, but loose enough that even a damp hand allowed the cue to slide through), which was the key to not only eliminating the wiggles, but to improving the stroke itself.
As long as my bridge is well anchored to the table (I thank Fran Crimi for her help with that) and I have a distinct groove or "vee" on the bottom of the loop, the cue goes through just as if I was using a vee to guide the stick while using an open bridge. The feeling in my hand is that the shaft is riding over the top of this vee, and merely contacting the index finger instead of using it to guide the cue in a physical/mechanical way. It is precisely this feeling that I think I would lose by using a glove.
I'm not recommending that anybody else should do it this way, just that it made a night and day difference in the smoothness and power of my entire stroke.