The matter of whom to support can be seen from Donnie's attitude towards Calles.
Although supporting Calles would enhance Ares Military Industry's interests, there's a significant chance that Calles, backed by Ares Military Industry, could defeat Aguirre and Escovar's rebel army. Even though Calles has learned a lesson from this incident, for Donnie, if Calles can betray their cooperation once, he can betray it a second time.
By then, Calles, having absorbed Aguirre and Escovar's rebel army's munitions, would be even stronger. If Calles betrays him again, it won't be easy to find someone like Aguirre or Escovar.
Thus, Donnie has decided to support Aguirre and Escovar in this matter.
As for some previous actions, they were just preparations for future events.
After hearing Donnie's words, Westglenn understood his meaning, as did Henry Dale.
"I understand what to do!"
Henry Dale left Donnie's room to notify Calles.
