Can you show me which information and panel say that bounty = strength ? This is the short answer.
Lets check in detail.
Based on bounty do you think crocodile can beat zoro ?
Based on bounty buggy can beat luffy ?
Lets check other perspective.
Sanji has never ever had third highest bounty in the crew . But he got every arc number 3 .
Zoro and Jimbei were famaous before joining crew. Sanji comes from nowhere. Even though he played most crucial role in alabasta arc , he did not get any bounty.
So, if bounty reflect just power wise ranking , i can agree with you. However , there are tons of parameter for that . I know your problem. how come a cook who only uses his leg at fight can be close zoro with 69 m bounty. So lame huh ?
Sanji always has been more impactful character more than zoro at evey arc.
Also , firstly where is zkk , leader of samurai , ryuma connection and revenge of otoko father ?
So lame.