There's no way that a late 60's bruce could handle a GJJ black belt. Combat just wasn't the same. Hell, a UFC 1 Royce would probably beat a late 60's Gene Lebell. There were Judo black belts in the early years of the UFC but the Judo curriculum pre-Gracie focused on olympic Judo as ground fighting Judo wans't respected. If Bruce was man handled by Gene, then I couldn't imagine him coping with Royce once the fight reached ground.