For what it?s worth I think the most plausible explanation for the Tague hit is a fragment from the headshot.
I'm not convinced of it's plausibility. A bullet that shatters into several pieces of which one piece makes a small dent in the chrome fitting of the windshield and another an insignificant spiderweb crack on the windshield doesn't jive with another piece of lead flying off dozens of feet and striking concrete with enough force to cause concrete chips to make a small scratch on Teague's face. IMO, the only plausible scenario would be like the one Haag proposed. The first shot missed, hit the street pavement and shattered and a piece of lead from that shattered bullet struck the concrete close to Tague causing Tague's scratch to face. The part where that proposal I believe is difficult is that there was no apparent hole in the pavement on Elm St. found.
The other proposal that had some mileage was Holland's proposal that the first shot hit the street lamp steel tube and ricochet from there..etc..etc.. That proposal was found to be unlikely by experiments done by Haag, I believe. That would leave a fourth shot fired from somewhere but there's no evidence of a second shooter, IMHO.