Ass grens are available to 1 pay commander, while shock/guards are on of the most common units in Sov commanders.. And even then, they are not half as strong as either of those 2 units (or as versatile). They (shock/guards) are even earlier than any possibly weapon upgrades for the Ost. It was a bad, unneeded decision to move them to 1 CP, which no one in the right mind support.
Move ass gren to 1-2 CP as well, I don't care about pay commanders, they are already breaking the game enough as it is.