"cool, Izzy's doing the same with Axl's band as he did with our band when we were touring." maybe something like that?
and they're probably all excited to speak to Izzy again soon to hear how Axl's doing these days.
Pretty likely. Izzy can do gigs with whom he wants, he's a free soul. Maybe S&D are pleasantly surprised by this turn of events, like "Axl now has Izzy to talk sense into him".
Can't see any animosity coming towards Izzy, that would be just plain silly and immature.