Bara Missiler was not sent out first, and wasn't grown by Acha and Kocha because he was already giant.
Silo was the first monster to attack the rangers, and after shrugging off their arsenal, was grown by Klank and Orbus.
The Choriki Mobiles weren't sent out against the Super Machine Beasts because Ohranger needed to focus on destroying the Super Machine Beast facility.
The Zeo Zords weren't dispatched because they would be destroyed against the Neo Plutonium empowered monsters.
The Blocker Robos were created from Choriki technology like all the other robos.
The Super Zeo Zords were created from gems empowered with the Gold Ranger's staff.
Ohranger tricked Baranoia into bringing the Blocker Robos into the facility, and destroyed it from within.
The Power Rangers did not trick the Machine Empire nor did they attack the Neo Plutonium facility, as all the Neo Plutonium had been used up.
Bacchus Wrath was thought to have been buried in the cavern after Ohranger destroyed it.
Mondo was still out and active at the end of the episode.
This is the second time Ohranger fight Bara Drill.
As the last time Drill Master appeared was in a dream, this is the first time the Power Rangers fight him for real.
The Super Machine Beast project was Bacchus Wrath's final plan, and with its failure, he would launch a final desperate attack in the following episode
With the Neo Plutonium army defeated and the Rangers possessing the Super Zeo Zords, Mondo would decide to take matters into his own hands in the next episode.