This is at the one year anniversary where English players came in. We had a good variety of stuff to play with now, and stats were around the 550 cost range.
All four of these are VERY different from each other.
We started from the end of the One Year War with the benefit of a lot of resources from GBO1 and eventually built chronologically prior to the RX-78 didn't get to use beam technology or special mobility tools, so low cost combat was down and dirty with ballistics and melee.
To keep it simple, every unit has a base cost in GBO2, and for the most part, battles in GBO2 will restrict you to play with units applicable to that cost. So you can't bring a Sinanju to a 0079 fight.
The Zaku IIS is a 200 cost.
The Sinanju is a 700 cost.