Can Izuku restrain Genos even with the LS advantage? Since Genos is stronger and has heat attacks he fires from his palm, can't he destroy Blackwhip? Izuku can't stop his palms from firing, and
he can do this AOE attack. Blackwhip doesn't really have any durability feats.
I hesitate to say Genos is a better fighter, since his own feats from this key aren't all that impressive. Off screen experience he might have doesn't really mean anything.
Genos hasn't really done anything Izuku can't deal with. In terms of fighting I mean. Izuku is incredibly smart and has experience with predicting the movements of things/people that are faster than him. And his Iron Soles allow his kicks to give a double impact as well. Which help with Genos' AP/Dura advantage.
Also Izuku has the Mid-Gauntlets as well, which are basically 7-A+ shields on his arm and legs. They reinforce his whole body somehow, but it's never explained by how much. Izuku can also use Fa Jin + Blackwhip to blitz people equal to him, and was able to break the arm of someone who is equal to him.
Genos advantage here is his big AOE attacks, and AP advantage. But Fa Jin handles the AP advantage. AOE attacks become weaker further away from the source. Genos' big blast while flashy, if Izuku is even 1 meter away the energy that hits him will be far less. His beams would be more dangerous, since they're condensed power.
Izuku's range at 20% is in hundreds of meters, 30% would have an unknown amount higher range than that. So Genos doesn't have a massive range advantage either.
Also how does Genos have better maneuverability? Genos Beginning of Series key covers a small part of Genos. Chapter 5 to Chapter 6. Next time we see him he has his High 7-C upgrades. So whatever Genos does there doesn't really affect his previous key. Not including his mentality or fighting skills, since that wouldn't change until more time passes.
But his movement isn't really all that great. I don't see any limited flight, information analysis, or even enhanced senses either. Maybe him confirming no living things were within 500 meters could be enhanced senses. But I'm not all that sold. Him having those things later shouldn't apply to a previous version of himself.
I feel like there is a lot of issues with Genos' profile for his first key.