But how would you know if say the polypetides with odd-numbered chain lengths had a different distribution of chirality than the polypetides with even-numbered chain lengths? (This is not meant as a realistic example, just an illustration of how a complex mixture of molecules could have some weird characteristic that you wouldn't necessarily know about and wouldn't even know to test for.)
I would expect chirality to be one of the easiest things to get right, so perhaps you ought to come up with a better hypothetical example of what you think MNTA might get wrong.