So, even he is not sure of what is the strength of the IA Akash SAM Group and is speculating. As I've said earlier, the SAM Group nomenclature is unique to the SA-6 held by IA Air Defense Arty(ADA) Regiment and we've only two of them; the induction of SSM with Prithvi was the next instance of Arty Regiment being called as Missile Group (the Brahmos units IMO, are called Missile Regiments). Other SAM units equipped with SA-8/OSA-AKM are called AD Missile Regiment (Self Propelled). Those equipped with ZSU-23-4/Tunguska are called SP Arty Regiments.“Each regiment is much bigger than a squadron, much, much bigger…May be five-six squadron is equivalent to one regiment,” Jain said
So, my request you to is to re-visit the numbers and re-do them. Also,for calculating the requirement of such groups, you can assume that each Corps on Western front at least will have one such integral Group.