There's a version of Les Brers he did with Derek during the Allmans 2000 tour that was as fiery as any Allman show ever, period. (I'll try to find this and add a link in the next couple of days.)
Anyway, here's a link to a seriously burning opening jam from HRS at Mexicali, 8/11/06. Whole show over here at archive.org
(And while Neil Fountain may not be the next Jaco, he is probably the most talented bass player I've seen since.)