Since this bread is full of shills and shitted up, I'm going to float a thought that isn't fully baked due to lack of evidence.

There was an Antifa-style bomb threat at a civil war reanactment in VA. It was held anyways because these people don't respond to threats. Talking to an LE on duty, there were 2 bombs found in the vendor tent area. These bombs were fully made with charge, shrapnel, and triggering device but with the triggers disconnected. It was done by someone with skill but not ready to take lives yet.

https:// virginia.ourcommunitynow.com/news/cedar-creek-pipe-bomb/

The FBI took over the case and nothing has been said about it since.

My guess would be the TX bomber is one in the same but has escalated like every other bomber does. How many skilled bombers are there in the country outside of MIL? I'll keep my eye out to try to confirm.