So, I had an idea. What if Rodimus Prime is the name Orion Pax takes the second time he takes the title of Prime? It'd be a neat way to give the fans Rodimus WITHOUT killing Prime. The change in personality to a more "Rodimus" outlook could simply be showing how Orion is adjusting to his new responsibilities, something Optimus had already done a long time ago. Barring Orion getting his memories back and becoming Optimus Prime again, I think this could be a cool way to handle what's happened to Optimus.