>>280786070>>280786910Double plot twist: Drive Knight is the cyborg who killed Genos's family on the orders of his creator, Dr. Kuseno. It was all a multi-step ruse to obtain Metal Knight's technology.
But the doctor is dead. Ah, that's part of the plan, whether using a clone or having transferred his consciousness in Genos's latest upgrade. The final battle will be Saitama vs. Ultimate Genos, fusing his body with Drive Knight, plus Metal Knight's technology and Kuseno's AI-controlled senses.
Basically, the final fight is Saitama taking a beating without fighting back, and ultimately making the decision to end Genos' suffering.
Well, that would be if ONE were an edgy teenager, probably the final conflict would be more humorous and less complicated with a little self-reflection.