I think a better angle to this would be which of them would be willing to allow like a regent council to guide their actions? Or act as Advisors? Wrathion could look to his time with Anduin and try to use that to guide him...Provided he cared enough to listen to Anduin's reason Sabel on the other hand doesn't strike me as I take others advice, Though if I was a blackflight being told he go do F*** all you want today its your day I would be like...That is something a human would say and jump at the chance of taking my own time but ask what would he be thinking gives us free time?