Mine:
Blackbeard/Luffy
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Zoro/Law
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Kidd
XDrake
Killer
Urouge
Hawkins
Bege/Bonney / Apoo/
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In general I believe that power scaling in one piece is inaccurate and although Haki is the unit of comparisons between characters but Oda hasn't given us a clear explanation of how it works ,as we see characters with stronger haki than others but are on the same lavel of mastery ...
Note: I put Bege, Bonney, and Apoo on same list tier because they have peculiar powers. In terms of damage none of them excel ... For example Apoo has a pretty deadly fruit but if you understand how it works he becomes useless ... In Bege's case he is damaging power is very little but he has a verystrong defence.... Lastly in case of Bonney her power is peculiar, she can manipulate others age so she can turn other weak because of age or she can become stronger but if you learn ot alter this like Law or use haki in the place she touch you then she simply is weak , also she doesn't seem to do damage in general and relies to much on her fruit