Makes me wonder why his voice lost the power as it did. I mean, obviously age, but maybe too much screaming and touring?
That would be my guess, he wasn't a singer and came late to the microphone, it took him around 4 years to find his voice, when he did he seemed to enjoy it...A lot and probably abused it a bit. Singing Genesis material didn't help, Banks had apparently no mercy on the singers Peter was constantly trying to reach notes beyond his key and it was no different with Phil, who has a completely different voice from Peter's. On top of that, the guy toured a lot, with Genesis and on his own. It must have been exhilarating for him to be able to sing stuff like Mama or TTT, considering he started with For Absent friends and More fool me, radical departure, he sounds like two different people. Finally, he got older and his general health conditions worsened. All this took a toll evidently. The mere fact that he has to sing seated would be a game changer even if he were on top shape, you breath differently and that has an impact on the sound you make.