Yeah, I'm not sure about that whole mass knockout thing being Rebecca's doing.... not when we saw her struggling against Suleiman at the start of the chapter. Like I said before, I think it may have Meadows, since he was the only one of the named D-block fighters who wasn't shown this chapter.
Oh, and before anyone brings up the possibility of everyone being knocked out by conqueror's haki, Sabo's comments ("That sure was fast") clearly indicates that wasn't the case.
What else..... well, I thought Thunder Soldier was cool this chapter. Heh, it's pretty badass how he pistol (well, more like rifle)-whipped all his enemies. I'm actually kinda interested in seeing how well he'd fare against one of Dofla's stronger officers myself, now....