Sure, but multiple times what those two metal would be on their own? (Yes, I'm sure there are some that exist, don't bother looking it up) Again, Nail was at 42,000 and Piccolo was probably at best around the same level (I say that because he was about as strong as Yamcha, Tien and Chaozu were during their training, and those three were able to stand up to the Ginyu Force, and yes I'm aware that was filler, but just work with me here, fellas).
And while we're at it, perhaps the bigger question is why did Piccolo want to be wished to Namek to fight Freeza in the first place? This was before he had any intention (or fuck, any idea) of fusing. He never came to Namek with the plan to do so. Seriously, what the fuck did he think he could do?!