dinner in 1998 to celebrate ARCHIVE 1. I couldn't find much detail, but one article claims that it involved "all former and present members of Genesis," which can't be true
The only members present, next to the "legendary five", were Ant Phillips and John Silver. You'll find a nice photo of those seven here:
Chester Thompson has worked with Steve and met Steve.
They even played together in Genesis in the early months of 1977.
Daryl Stuermer, too, met Steve as early as he joined Genesis. There's a quote in Armando Gallo's book, something like "A guy turned up telling me I was his second fave guitarist, and that guy turned out to be Steve Hackett".