I think Kid Chocolate may have been better relative to their respective sizes, but he was a FW/SFW, whereas old bones was a fully fledged LW. Even allowing for size, Brown was beaten by lesser fighters than Kid Chocolate in many non title fight, but if the LW title is on the line over 15 rounds, I'd take the bigger Brown to get the victory.
Damn,kinda forgot that one too, should've been fooled since Canzoneri,a lightweight fought chocolate.