You are pretty sure, that's ok. That's an opinion and you are entitled to it.
But the "fact" of the manga is, that it was never ever mentioned that they fought/got defeated by Hanzou. And that they are wearing Anbu clothes, and as we all know, nin arent at their strongest when they are in Anbu. Examples are:
whom both got way stronger AFTER Anbu.
any how I rather base my opinions off facts at least thats how i am. but like i said everyone is entitled to an opinion.
Hanzou could probably kill 'em at that point, it sure didnt seem like they wanted to fight 'em but you got to consider just how strong would they be as anbu members compared to when they were in their prime, and also how friggin old must Hanzou have been when Pain killed him.
Not to mention we dont even know how pain killed him to begin with, so for all we know pain could've been fighting dirty.