Has there been other news coverage of this? Regarding what this article states:
Yes, it's possible for one man to overpower 2 others. If the first blows to the face were a surprise move they could easily have taken the first guy out before his companion could react. Then it became one-on-one, and if the assailant was bigger, or stronger, or more experienced with fighting he might have had the advantage.
As for the blood, the broken jaw was the only injury reported in the article. But other facial injuries from the fists could cause a broken nose and cut lips, both vascular sites which will bleed profusely. And the report of blood "gushing everywhere" could easily have been the exaggeration of an excitable witness.
The victim of a facial beating will often be drenched in blood. I've had to investigate fights like these myself, and the amount of blood can be quite disturbing, even if the wounds aren't very deep, as with a knife stabbing or a gunshot, injuries which can actually produce less blood in some cases.
If the police do a proper investigation there's a potential to develop good leads. Even without surveillance cameras there would be witness descriptions. The assailant might have gotten blood on himself which people on the street could have seen, revealing his escape route. His car if nearby might have been spotted.
It sounds like these guys were getting a slice of pizza to go, or to take to a table, but perhaps their attacker was there for a take-out order, and he had given his name and telephone number when he phoned ahead. He might also be a regular the staff knows. Fingerprints and other forensic evidence could be found at the scene.
So that if this report is reliable, and the police do their jobs, it's not impossible that this guy is gonna get caught. What I didn't read is that there is convincing evidence that this was a gay hate crime, versus being a random act of violence. And even if it were a hate crime, I don't believe Texas recognizes gays as an included category, so it would be treated as ordinary assault.