Don't feel bad for not doing the necropsy. You're not likely to learn anything excessively useful considering this wasn't a contagious disease. Best to save your money for the future. A necropsy is a luxury few among us choose to pursue and it's never an easy decision, but it's not one you need...
Oh no :( That was awful to watch. Poor little guy. My brooder coop from the inside looks just like this, roost and all, and I raised seven pullets who roosted with no issue. It looks like he hit underneath his chin which tipped his head back too far and I feel like that could happen on nearly...