Can you actually read? I literally posted Luffy twice affirming that Mochi /> Rubber. The whole point of the fight was the
Future Sight was the difference maker, not the DF.
What Mochi can't replicate is the absurd elastic tension of rubber. That's why Luffy in Boundman can knock Katakuri's teeth out even with superior CoA, and why Luffy can take a fucking beating for 12 hours straight, and Katakuri folds in 30 mins.
Rubber always bounces back. Mochi doesn't.