You summed it very well. Victim is in trouble if there was no weapon on the intruders. Maybe. Victim most likely will have a harder time. But it might take more work to be exonerated without being charged or taken to trial. I know of one case where unarmed criminal in break in was shot in the back, died. Case went to trial - deadlocked 8 - 4 in defendant’s favor. State chose not to retry. Better to be alive and charged than dead. Unless one has been in such a situation, one does not know what the heat of the moment will do to one’s thoughts and actions. Monday morning quarterbacking is easy.
I think the victim is in more trouble because he spoke to the police without benefit of a lawyer.
Don’t talk to cops, talk to your lawyer and let him talk to the cops.
A man who is not well trained in shooting with instant reactions a la spec forces confronting three men with your gun out, if one of them pulls a gun from his waistband suddenly the move can freeze the defender for a split second allowing the bad guy to get off the first shot. That is how it is that store clerks often kill robbers who are already pointing guns at them. In such confrontations both parties dying is more likely than that the clerk alone will die. Most often the bad guy gets shot and the clerk does not.