What a great guitar player and what a fine job he would have done playing second guitar for DS! Specially during the OES tour!
No I think it would have been a "problem" to have 2 great and style-close guitarists in the same band imho
Vince Gill would have been a too much good challenger for Mark in songs like
setting me up for example, and i think that Mark doesn't like that a band member "steals" the stage light, mainly during the OES era
in recent tours, he gaves opportunity to John and Glenn to be the "stars" during
Marbletown but that's a different thing, ther are not guitarists
in all tours including DS and solo career, the 2nd guitarist never had the chance to really exprime him self, except very few occasion (Jack in WWE, TYL,EL, PI, Hal in TYL, PI, lick in Sultans, RB on steel or Romeo in Boothbay, and few other examples..) so maybe Vince Gill knew that he would have been frustrated to be the "second" guitarist ?.... and that's why he declined:think