User blog comment:DancePowderer/Haki Problems/@comment-194.25.108.80-20110121070716

I've just read some old chapters and when Zoro fought Miss Monday at Whiskey Peak (Chapter 108). When he holds her head tight, she spills those foam and he asked her, where all her strength has gone... The foam-thing looks exactly like when Haōshoku Haki has been released by others... It is no proof, that can only Oda do. But a hint... And from Zoro there are many hints during the whole story...

The rest: I agree.