User blog comment:Haki73/Mihawks Training/@comment-2031609-20100907204519

Haki is definitely possible. Mihawk was Shanks' sparring partner after all, so it's likely he can use haki too. His strength will grow immensely. His "power of destruction" will increase drastically, as in he'll be able to use an attack similar to Mihawk's long-range slashing attack, or at least be able to use his own long-range attacks at longer distances. His vision improving is also a good call.