What genetics? Being prodigy? Very strong in combat?
Luffy was a weakling crybaby who always lost to Ace and Sabo.
Luffys genetics is kinda fodder bro. He spent timeskip training with Master Rayleigh. He started timeskip pretty strong, while rest of the crew didn't experience Amazon Lily / Impel Down / Marineford, Luffy got stronger in all 3 arcs.
Yet he left timeskip as fodder. No FS, no awakening, no advanced CoA, no advanced CoC.
Lucci whom was previously defeated by EL Luffy, and not being trained with anyone, left timeskip with advanced haki and awakened DF.
People need to stop thinking as if Luffy or Monkey D. family as super strong, prodigy, etc. They aren't all that.
All mediocres.