Yes there is more than one shooter. 4 according to the indictments. Gary was shot with larger caliber bullets so that is more evidence there was more than one shooter.
This has been discussed many times but you bring up a good point that might explain why there were a differing number of shots.
The ones who were shot the most --- CR JR (4), DR (5), HG (5) and CR SR (9) --- could have all been shot by the same gunman. Gunman "A" shoots Dana while gunman "B" or "C" or "D" shoots HR only twice. Gunman "A" finds CR JR and shoots him.
"A" shoots HG while "B" or "C" or "D" shoots FR only 3 times.
"B" or "C" or "D" shoots KR only 1 time.
The number of shots could have been revenge/level of hate, or simply different shooters where you have some shooters more sure of themselves, especially with KR, and then you have the shooter who is not so sure of what he's doing and he shoots way too many times.
I could tell---from the day we learned about the number of shots---that these murders were not "professional" in any way. "Professional" drug hit men are not that sloppy. One or 2 shots only. Especially with CR SR, his was a very unorganized crime scene reeking of local amateurs taking revenge. I was not surprised when they were arrested. I am surprised that they chose to do this, if indeed they did....2 Cents.....
BBM
Not saying you are incorrect, but, keep in mind that one shooter could be carrying more than one gun. With four murder scenes there could be one shooter and more than four guns used. A different preloaded gun could be ready for each house. That could even have been part of the strategy of confusing LE and covering their tracks...