Board Thread:TV Show Discussion/@comment-1399600-20160629121258/@comment-5308269-20160709235758

Irritator wrote: Cregan Stark backed up rhaenarya during the Dance of the DragonsAegon 2 had the better claim to the Iron Throne though. During the great council of 101 at harrenhal, Lord Ellard Stark backed up Laenor Velaryon for being king , despite that in proximity, favour goes to Viserys , the last rider of Balerion the Black Dread himself

I don't know much about the Dance of the Dragons incident, but when it comes to individual houses they still regard the line of succession as their own personal justification to rule. That Cregan Stark backed Princess Rhaenyra doesn't justify anyone else violating their own oaths to their liege-lords. At least Rhaenyra wasn't a bastard with no legal claim to a royal title.