An example of a song....reading sheet music  ..guitar 2 does all the rhythm ...guitar 1 does leads...then guitar 3 and up does misc fills and backing tracks intermittently through out the track....if there is a dead spot the extra guitarist can double up on rhythm

sure u don't need all the guitar parts in a live setting and most bands dont add everything from the studio tracks into a live performance ...but if u want to have them there, especially in most gnr songs, there is ample opportunity for 3 players ... as proven in the modern live era of gnr .... problem u could get tho if not mixed properly is that guitarists can create a bit of a wall of sound and drown out other instruments and/or vocals

GnR is a guitar driven band...and as a guitar player myself...giving guitar parts to a keyboardist sounds counterproductive

And to qualify ... I don't think they need 3 gutarists ... but if they chose to do it we all know it can work

Just picked up fallout 4 for ps4

Depending how many guitarists ... slash will do all slash parts and the other guitarist(s) will share rhythm and fills

My guess

Unfortunately very few drummers get critical acclaim...or even acknowledgement

John Bohnham
Neal Peart
Tommy Lee
Phil Collins

Obviously there are more famous drummers ... but from a reunion standpoint here I don't think it'll matter too much as long as Axl, slash & duff are up there

That happened to me a bit when I read the book American Psycho by Brett Easton Ellis...it's not about a real serial killer but same idea and the writing is extremely graphic