I thought there were pics of at least one guy wearing “colors”, still armed, talking to uniformed LEOs after the action as opposed to be sitting on the curb in cuffs.
The “Red Boots” guy.
There's a pic of a guy in plain clothes holding a rifle and wearing body armor. I don't think he's wearing "colors" and it seems it would be hard for him to blend in strolling around the patio with a rifle and bulletproof vest.
The speculation about him being undercover and involved is just that - speculation - and in my view it doesn't hold up.
I also think it very unlikely that the Waco PD would issue a press release stating something that would surely be dis-proven in short order once cases start going to trial.