Nygma was pretty nuts this time around. His other half was even channeling the Reverse Flash! I wonder how long he can hide this. Lee is bound to know something when she doesn't see Kristin for a while. I don't want Gotham PD to lose Ed so quickly (although when they do, I'm sure the show will find some way to keep him around).
Yeah, heel to the throat. Gruesome. I wonder how much longer the rest of the Strike Force will last?
There's really nothing that could tip him off at this point, though. Jim put together all the convenient stuff around Theo's rise, but Bruce wasn't there for most of it. And Silver makes for a great distraction, it'd look weird if he was immediately suspicious of her.
Who says he had to gather them up then and there? Penguin's supposed to be a smart guy, it's possible he had thought of this in advance as a contingency plan and already had them lined up in his employ (and, naturally, he would assure them that this isn't a suicide mission). But yeah, total Silver Age move.