in ASoS, Barristan/Arstan was trying to get Dany to abandon the quest for an army and go back to Pentos and place all her faith in the middle man Illyrio to secure allies for her. He goes so far as to lie about how half of Westeros would support Daenerys. He mentions that Rhaegar was greatly loved throughout the kingdoms and that invoking his memory would bring lords to her cause. In practice, we see that very, very, very few had love or admiration for Rhaegar that Barristan claimed they did. Why would she use her brother's memory as a means of gaining support? Will they be fight for Dany or Rhaegar's Ghost.