As for the tech, I got the impression that the General guy who returned found the tech on his adventures. However, he decided to ally himself with the lizards instead of sharing it with Thundera. I got the impression he'd been gone for a while, so they probably at least needed a few months to learn how to use it all. That or he met Mumm-ra and then Mumm-ra gave him the tech and told him to use it to ally with the lizards.

Though I have to ask what happened to Mumm-ra at the end to prevent him from transforming? Was it a laser blast? That was a bit disappointing.