Is the link you gave the good copy or the out-of-sync copy?
Are the original “Brandon and Dale” and “Dale and I” tracks mono?
It may be theoretical but if Dale is centre as you describe then you could duplicate your track then isolate Dale on one copy of the track using https://forum.audacityteam.org/t/karaoke-rotation-panning-more/30112/1 . Then remove him from the other copy of the track then you can slide the isolated version along using Time Shift Tool (F5) and mix it back in.
Of course you may lose a lot of quality that way.
What do you mean by “high resolution”?
Gale