Yes, Zoro wasn't satisfied with his attack because he wanted to take out Kaido with it. Regardless, he is still the first person to scar Kaido in hybrid mode, his strongest mode.
The broken bones was an excuse to weaken his attack and stop him for causing even more damage to Kaido and severely weakening him early on. His flying dragon blaze scared big mom. There would be no reason for that attack to scare her if that attack didn't have the potential to cause him significantly damaged. That was before she saw him cut Kaido.
You are forgetting Zoro's goal is become the WSS. He has a strength base goal and Kuma already considered him to have equal value to Luffy pre time skip.
You are forgetting Zoro's goal is become the WSS. He has a strength base goal and Kuma already considered him to have equal value to Luffy pre time skip.
BM realized that Enma was a special sword and warned Kaido who was going to tank it like an idiot, a narrative that was constantly pushed again and again on rooftop. Flying dragon blaze is a move that didnt amount to anything and was never used by Zoro afterward. Flying dragon blaze has no actual feats and is probably only as good as Tatsumaki
BM underestimated them as she said. Scared? You are out of your goddamn mind here