Alex_Van_zyl
Well, Howland Reed might have the journals of Rhaegar and Lyanna (I don't believe there's nothing left in the tower!). Maester Aemon has the sword Dark Sister, and the dragon Canibal is on Skagos! With the help of the dragon, John can destroy Pentos and exterminate the Dathraki (if he takes them to Westeros, then no one in Westeros will support the person who brought the savages and murderers). After the death of Ned, Jon can fly to the dragon stone and expel Stanis, the Cod Lords are already loyal to the Targaryen and absolute loyalty to the dragons.