It is possible for an initial aggressor to gain back the right to self defense. If they cease the offense, and the other person retaliates with unreasonable force, then they can use reasonable force to respond. I'm not talking about someone pulling out a gun and shooting because they're losing the fight. That would be like Drejka. If you ignore that he was the initial aggressor against his victim's girlfriend, and this guy just shoved him to the ground for no reason. He would be reasonable in displaying his firearm as he is on the ground and the man who knocked him down is approaching. However, the initial aggressor in this case ceases the fight at the display, puts up his hands and backs away. Then Drejka takes unjustifiably offensive actions, and at that point the initial aggressor is legally entitled to defend against that attack.
I've discussed all the relevant facts in this case ad nauseum. He is not guilty of 948.60, he is exempted from 948.60 2a by 948.60 3c. This will be settled at trial. It is irrelevant, as is his age, to the intentional homicide charges.
As for the alleged straw purchase, we discussed it at length dozens of pages ago. Neither of them has been nor will be charged with a straw purchase, because it wasn't. If they are at some point, it will be another not guilty verdict if it ever goes to trial.