The Tai Xuan Alliance had four strike squads in total.
The Shen Yao Empire had three.
The Qi Cheng Federation fielded four squads.
As for why these squads did not concentrate their efforts and pool their core forces together, the reason was quite simple.
The Pillars of Filth, crafted by Dragon Sleep Valley, covered an extensive area; only by dispatching individual squads could they manage to purify these Pillars in time.
Moreover, even without this reason, it was almost impossible for the squads to journey together.
All being from the Law Realm and from different great nations, how could they possibly cooperate closely? Teaming up often resulted in a scenario where '1+1<2', so it was better for each to lead their own team along separate paths.
Even from the same great nation, many lords found it challenging to work together intimately.