#2
Well...

"Blue Sky" is off of The Allman Brothers Band's 1972 album Eat a Peach.

Derek Trucks wasn't even born until 1979...
#3
Both Duane Allman and Dickey Betts played lead on the bridge solo.
Duane plays the first solo lead, while Dicky Betts plays a supporting rhythm.
At roughly half the solo, at 2:30 in the track, Duane and Dickey switch roles and lock back in together within roughly half a bar (2 measures).