I hadn't thought that far ahead, (or didn't want to believe it after Col. Ryan gave up the "good life" for his men during "Pandemonium",) but with what's known about a commanding officer having an affair with the wife of one of his men, that seems like a plausible underlying story line. Ryan's life would literally be at risk for his indiscretion. His command would be gone if he wasn't killed by Mac. Before Hector was shot, the fact that such a bad choice of extraction vehicles was used was suspicious. (How about armored Humvees or personnel carriers?) Or that he was the only one killed by the sniper, (a 'real' sniper would have killed more, what with them being trapped in an unprotected area,) was suspicious. And yes, even Jonas being compelled to go alone after the "Butcher" was suspicious. (If we believe Jonas, as the top man, would be the one person Hector would tell.)
The details of what a small, secretive unit goes through with the loss of a comrade; the emotion, the secrecy, the anger, the sense of duty after his death, is important to tell. Yet for me it did little for the overall impact of the show. (Barring Ryan's involvement and him paying the price in the future.) In fact, just the opposite. With all the horror they face it's important to have the balance of different characteristics of heroes. Hector Williams had his own distinction.
They did an episode when a member of Bravo Team was killed and the family dynamic was explored in depth. The details of how they honored Hector at the end of the show was more than touching and I actually feel a loss for this mere television character. Yet I think the same could have been done with an outside Unit member, with near the same impact being shown through the memorial process.
They could have even wounded & disabled him while a different, non-relevant character died and then show both the tragedy of the loss of life and the tragedy of loss of Unit membership while bringing even greater gravity to the mortal danger they face.