#4 Nikki knows a secret
Someone attacked Aleister Black (in kayfabe) and ruled him out of action for the last TakeOver event. In reality, this was done because Black had suffered a grievous injury. This forced William Regal to conduct an investigation into who could have possibly carried these attacks out, unfortunately with not much success. But Nikki Cross was on the roof of the building, which provided her with a vantage point and yes, she perhaps saw who carried the attack out.
Nikki Cross came out and told Ciampa that she knows what he did. Before you think that he carried out the attack, let me just say that NXT will never make a storyline so very simple. Moreover, Cross repeated the same line to Kassius Ohno.
I really love how unhinged Cross comes across when she slips into character mode. If anyone deserves the moniker of the 'Lunatic Fringe', it's most certainly her.