I agree with most, from what I heard in bootleg concerts, Steven can still sing the high notes/screamin notes on songs like Cryin', Dream On, Walk This Way, etc...

Jon got a more friendly, "for all fans" type of voice, but he lets the fans sing on areas he cant sing, or just keep silent on supposed to be high notes, like Runaway, Livin on a Prayer.

Both are still my gods though!