I still am anti-massclaiming.
EVEN if we catch scum today, we still have a few more nights to go through. We've let scum know exactly who to kill, exactly who they need to fear, exactly who's harmless to them. We've directed scum's night kills to minimize risk, and that's best case scenario, mind you. We don't know scum's powers, but it could turn out this could be very, very, very beneficial to them.
FoS to everyone who said "Yeah, if Xeiron goes first, we'll claim everything. Major major FoS. Scum WANTS this information out there. Know everyone's item? Heck yeah, that sounds great!
The worst part, by far, is claiming used powers. The OP warned us exactly against this!! If I say I got item X and Y N0, and used power A on N1, well, you've claimed a combination, basically! Awesome! Do we want scum to know combinations? I reaaalllly don't think so.
What happens if you have a town player who claims they've received four items, but haven't used any yet? Guess who scum's going to want to kill tonight? If someone has no unused items, which would be pretty easy to determine from the claim, they won't be able to use their items until N3. But someone who has unused items would be a great NK target for scum.
I'd support this plan, if we didn't have to risk probably two more nights. Two more nights is wayyy too much time for scum to capitalize on this plan, even if we do catch scum through it. And I'm not convinced we are.
I think massclaiming is an awful awful awful idea.