“high screams” and “powerfully wide vocal range” are pretty much mutually exclusive.
He pretty much lost his true voice a while back, like Donald Fagan and so many others. The vocal instrument doesn't last forever.
So, ya’ put together a duet:
https://www.youtube.com/watch?v=lw720PLWW84
(Although John Lawton could do a decent scream in addition to power, Bernie Shaw had him beat on screams.)