ChiliD is correct of course, Billy Burnette was basically the male voice of Mac during that period and his playing was mainly rhythm(from what I have seen, anyway, since there has been pretty much a Fleetwood Mac blackout for the past 15 years in the UK!) and Vito took on the more serious guitar work. So two "men" rather than "guitarists" replaced Lindsey, sorry to "offend" anybody.
The point I was clumsily trying to get across was that to find a single guitarist with Lindsey's skills in terms of playing and, of course, to sing with such power at the same time would have been pretty difficult, impossible even, to find in such a short period of time. The job fell to two men.
And so then Mac happened to have two guitarists as well which can't be a bad thing in the bargain. But, even with two men playing the axe they were never going to get "that" sound that Lindsey pulls off because their styles are so different. Vito and Burnette are very talented men but not "technically" in the same league as Lindsey.
* Any Ledgie easily offended, don't read the next line!!!*
It's irrelavent to me because in my opinion Knopfler is a better guitarist than any of them..... Full stop.