something permanetly reset my email accounts from installed mail applications (Samsung Note II stock and Gmail app)
Well, like the other forum I would also say there's just no problem with using two or more devices over a single gmail account. I remembered you said that "local mail servers and Gmail server"data gets deleted. I think that might happen because of something else i.e not related only with the gmail account. Do one thing try factory resetting your device and then try putting the gmail account back in place and see if that again disappears or not! 

PS: Make sure you backup your data before moving forward with the factory resetting.