Okay, with some consideration, here is the ultimate claiming plan. This depends on whether we even want to claim - there are reasonable arguments to be made against claiming, I think - but if we claim, this is how we should do it:
1. Everyone with a role out of {Watcher, 1-shot BP, Goon Cop, Bodyguard} claims. If contradictions arise form this, we stop. If someone claimed, go to 2, if not, go to 3.
2. Anyone who can contradict the claimant claims. If noone does, massclaim, and we'll get two contradicting claims. We lynch one of them. Stop here.
3. The Detective claims. Why is that? Because at this point, we know that if Ichi tels the truth, there must be a Detective in the setup. If someone claims (and noone counterclaims), he's IC (either Ichi tells the truth, then there must be a Detective, there is only one; or Ichi lies, well then Ichi lies, and everyone else tells the truth). If noone claims, we lynch Ichi.
4. If this all didn't lead to anything, the rest does not need to claim, because it won't give us much further information. We lynch among Ichi and whoever didn't claim Detective.