From the very beginning, Grehha considered himself a Mammoth Clansman, down to the very core of his being. And he was damn proud to be one, even with everything against the Mammoth Clan, including the existence of the Celestial Boar looming over the Mammoth Clan's fate.
And the build he created at the very beginning was his endgame build. It accounted for all the changes. The direction of thought was the same as Inala, which was to use swarm tactics. However, the intended motive was different.
Inala had planned to use the Prana Bombs of the Zingers to constantly steal the Prana and Lifespan of Brangara, depriving him of the means to make a recovery and remain fighting for long. The army of Zingers was there to bombard Brangara with sheer numbers that outpaced his digestion capabilities.