There were 9 votes before law voted, which with one with VP ( had to be 2 imo since more would've hammered before Xlaws vote) meant it was 10, with law it was 11. The majority was 11 and it was reached.
As for Usopp anything he says doesnt matter to me, he's outed scum and if he was a DV then the votes wouldve hammered before Xlaw and Ultra who voted after.