I recall an interview in which he said "my sh*t is so simple, anyone could play it". Such humility from a guy who was able to convincingly share guitar duties with Skydog! No small feat!
I’ve always regarded his solo on Stormy Monday as a masterful example of how to build a solo. He starts off sweet and soulful with lots of space and lovely phrasing and increases the density and intensity of his lines to reach a screaming peak. I’ve always treasured his playing from the Live Fillmore shows as much as Duane’s. And listen to his slide playing on Melissa. Talk about making a guitar cry. I can’t but think he was pouring out his grief over Duane’s passing.
I would disagree that Derek lacks chops compared to Dickie. Derek has phenomenal chops. What I hear in Betts’ playing is a less overtly technical approach that is extremely melodic and emotionally direct. This is my perception. Others may have a different take but we can all agree on one thing-- he was one of those players with an easily identifiable signature style. This alone makes him very special.