People are not suggesting he'd win against mingo but gain time for his captain, instead of the others.
I would like to ask those people how Zoro would know where luffy and don is or how there health is ?
Also your saying zoro should let a whole bunch of people die while running to luffy ?
don't wanna see zoro beat doffla , just that the " he is far away " reason to explain this is not a valid one .
I don't think that it is a excuse but don't forget zoro was using Kanjuro bird to get to where he is.
So it might be far but that not really a big problem .