They’re not Dragon. They’re “Above Dragon,” which is the level that Murata/One put Boros and Orochi at. They’re with Orochi at the low end of Above Dragon. There’s a pretty big gap between Tats/GS/Orochi and Boros/Garou
That was their first fight. Little DSK was equal to injured Genos. Genos got stronger after beating G4 and taking his parts as upgrades, and two shotted big sea King in a simulation. Sneck, Metal Bat, Darkshine and Zombieman were there too.