Okay episode, pros and cons balanced out I think.
Previous speculation was that Itachi couldn't use his M. Sharingan because of the clone's normal eyes. If these clones of Zero's are "perfect" replicas, with every bit of anatomical detail mimicked, then the M.Sharingan should work, leaving the only real limit being the chakra sacificed, as they put it.
But in the case where it can't be replicated, then the same should apply to the regular sharingan, shouldn't it? Bloodline Limit- Can't be learnt or copied. Genetic.