To my ears The Delegates Of Soul "I'll Come Running Back" sounds like a group harmony funk record, but because Butch played it, it's mysteriously become a northern soul oldie... I think there's a bit more cross-pollination than most would like to accept.
Also, just because a record mentions "funk" doesn't mean it's what we'd define as funk. As previously mentioned funk was a slang term referring to the smell hanging around a room after, you know, doing it... And the word jazz was a slang term meaning, well, you know... doing it. So quite how jazz-funk is the unsexiest music ever made is a bit of a conundrum...