look), if Gendry was indeed Cersei's and Robert son it would not matter to the other kings (only to Stannis and maybe Renly), but the Targaryens think Robert is an usurper, they will not stop trying to get the throne back because his son has inherited the title (IIRC Dany does not know of Cersei's incest, but she still thinks the throne is hers by right)Besides, if Gendry was Cersei's son and Varys tho