[quote=Lucian]
What about Mellisandre, Jorick? She may still have pushed Stannis toward the Iron Throne because of her belief that he is Azor Ahai reincarnated. If she managed to get her claws in deep enough, he may even have rebelled against Robert.
[/quote]

I find this to be a bit doubtful, given how lawful Stannis is. Also, keep in mind his banner men used to be Robert's for the most part. He wouldn't have had enough bannermen to challenge Robert, and the rest of Westeros that was a part of Robert's Rebellion would have supported the king, not his usurper brother. You can see how well thst worked for the Greyjoys, and they had the largest fleet in Westeros.