User blog comment:EpicElijah/The Stone Army and the FSM/@comment-27747281-20160311210123

The Stone Army wasn't necessarily more powerful, as the Golden Power has already been established as being able to defeat them. Still, it's better to have SOME help than none at all. As for why he didn't make them any sooner, keep in mind it was extremely furious battle, with the FSM and Overlord having to occasionally hide in their respective temples from time to time. During their hiding times, they could've set to work creating the Golden Mech, Celestial Clock, Stone Army, etc.

As for why the FSM didn't make his own army, as I said, he was probably creating the Golden Mech. Also, it's just a personal headcanon of mine, but what if he DID make an army; the Serpentine. My little theory is that in order to combat the Stone Army, the FSM made the Serpentine, hence their paranoia of the Overlord's return as the Golden Master, war-like culture, and various strengths and powers. They were MADE to fight the Overlord. Granted, they lost pretty badly against them in The Day Ninjago Stood Still, but one could argue that the Serpentine had expended most of their strength destroying Ninjago City's foundations, and that the Stone Army had technically only trapped the Serpentine in the tomb and not outright won, and even then the Serpentine did manage to eventually escape the tomb on their own.