I believe both would want to step up and willing sacrifice themselves for the sake of the living but Olenna tyrell tell cersei it was me game of thrones shirt they are truly to important to the people of the seven kingdoms & therefore the decision to bring Gendry back & his Targaryen blood becomes even more relevant.
Olenna tyrell tell cersei it was me game of thrones shirt
So if this information could be found & Dany/ Jon & the rest of the ‘team’ Gendry, Jorah, Sansa, Arya,etc were informed of this development it isn’t too far fetched to believe that they would come to the all be it extreme conclusion that I have. To kill the Night King you need to be able to get close to him & also somehow be able to take control of the now white walker dragon, & who better than someone with Targaryen blood, as I’ve previously stated we currently know of 3 people Olenna tyrell tell cersei it was me game of thrones shirt with said bloodline. Dany, Jon & Gendry and this is why Gendry’s long awaited return in series 7 becomes important to my theory. Dany & Jon are crucial characters & although if this all be it slight out there plan was made
Let’s assume that all Targaryen can have a bond with the dragons & be able to ride/ control them as the dragons see them as family. So linking said bond & the hopeful assumption that Sam finds a way to reverse a person being a white walker I believe Gendry could be the one to step up and sacrifice himself as the reversal back to human form probably wouldn’t be guaranteed & many around Jon & Dany would also agree they are far to important to the seven kingdoms and therefore Gendry would be the only other choice for the mission. So the next part could go one of two ways Gendry goes beyond the wall alone with a supply of Dragon Glass & inputs this into himself through his chest like the children of the forest where shown to have done to the first men or Jon demands that he still go with Gendry & it’s Jon that puts the dragon glass through Gendry’s chest and waits out of sight with the things needed for Gendry’ s white walker reversal. Either Jon with the bag or the bag of items left somewhere out of sight in a secure location waiting for Gendry’s return.
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