Forgot to reply to this amidst the heaivng mass of "braaaaains".
The combination of mail and plates was a very common type of armour in the Indian subcontinent yes. Not in the least because the major power on the Ganges plain was often a conqueror from the outside with an origin back into the areas that used such styles.
However, this is a very different beast from Western platearmour and is no where near as protective as full on platearmour. It's more accurate to consider it a special type of chain/splint mail really, or a chainmail with some excessively large rings included. So to say. I will still contend that there was no actual platearmour in any wider use as was the case with Europe. Obviously the heat and humidity are a problem also for plate wearers. And note all of the Indian continent is more or less tropical, the Northern parts are still decidely hot in summer. The British Raj had a summer capital in the Himalayas 2kms altitude for a time to get some decent coolness.
Re: Zombie stuff. This is a link to what I believe is part of the sparks for the discussion: http://zombie.wikia.com/wiki/Battle_of_Yonkers
So have go at reading that description and poke holes in the explanaiton I guess. Am sure tere are some. It seemed a bit more involved than what I recall from the book, which ofc is framed as the memorires of various people living thorugh WWz.