User blog comment:Monkey.D.Me/League of Red Stuff .. no, its not KoolAid/@comment-4630086-20120504115218/@comment-3075024-20120504175427

Yep .. in Zori's forum(before it was removed)  it said ..

Luffy F (B)

Zoro XF (AB)

Nami X (A)

Usopp S (O)

Sanji 〔RH-〕 Chopper X (A)

obin S (O)

Franky XF (AB)

Brook X (A)

So it just as you say, all blood groups from OP are related to real-world blood groups in specific order .. thanks for the explanation Arz.