This clip starts with Eric Clapton talking about how great Duane Allman is on this song, and he is great. Towards the end, when the horns are pounding, Duane’s searing lead guitar is a harmony and a challenge at the same time. That makes the arrangement all the richer.
Still, listening now, the audacity comes from the idea of an Atlantic artist covering a No. 1 hit song in a deep an meaningful way. That may have happened before, but it never happened before more beautifully.
Duane was a part of that, but it is the overall arrangement that makes this one of the great R+B cuts of its time.