Bobby does that all the time, often in the last few lines of a song when he's all pumped, i used to think it was strange but its just Bobby all energized. hard to swallow at first yes but its Bobby and hes wailin'!
i think Bobbys songwriting made for some great outro's, he always gets to shout over and over the last lines, i think its freakin awsome!
Brent is the high voice on reckoning, he did some higher vocals 79- i dunno early 80's listen close and youll be able to follow Brents maturity in his playing and singing over just a short 5 year period.