Just to remind you who Gendry is, and why someone needs to legitimize him as Baratheon.
Gendry: But just explain it to me. He offered to have any three people you wanted dead. All you had to do was give him the names. Anyone. You could have picked King Joffrey.
Arya Stark: Shut up!
Gendry: You could have picked Tywin Lannister.
Arya Stark: Jaqen got us out of Harrenhal. So why are you complaining?
Gendry: Because you could have ended the war!
Thoros of Myr: Where’d you train?
Gendry: King’s Landing. Tobho Mott’s shop.
Thoros of Myr: That criminal! He charges twice as much as every other armorer in the city.
Gendry: That’s because he’s twice as good.
Gendry: How’d you know he was a knight?
Hot Pie: Well… ‘cause he’s got armor on.
Gendry: You don’t have to be a knight to buy armor. Any idiot can buy armor.
Gendry: I’m done serving.
Gendry: Oh, you like picking on the little ones, do you? You know, I’ve been hammering an anvil these past ten years. When I hit that steel it sings. You gonna sing when I hit you?