Vow of Poverty + Vassel of Bahamut

[Wrathamon]

how about VOP and Kensai with Unarmed attack as his weapon of choice?

 

[Ridley's Cohort]

how about VOP and Kensai with Unarmed attack as his weapon of choice?

Yes, that is a loophole. It is less abusive than you might think at first blush. The Kensai is presumably "giving up" significant class abilities in order to have that weapon in the first place that should balance out. YMMV.