I really wanted Adrian to be on the debut album. No offense to Dennis Stratton (the debut album is gold), but I love Adrian and if he was on the debut album, it would have been great.
I think Adrian was asked to join in 1980, but he refused and stayed with Urchin (only if he knew for what band he refuses). Adrian and Dave are friends from school.
Phil Collen from Def Leppard also was approached by Steve after Dennis departure, but if that was before connecting with Adrian ? Phil is more of a glam metal guitarist and I definitely cannot see him in the Killers album.