Why do I need them?
"No," Nero answered with a voice full of conviction, without a moment's hesitation. This was a question he answered without a shred of doubt in his mind, even though he had coordinated with Vanessa before. That was because the question was that had he colluded with them against the interest of Kolar. He genuinely and firmly believed that by working with Vanessa, and improving himself and making himself stronger, he was working in the best interest of Kolar.
But this was a tricky game. Not only did he need to remember his answers, he needed to maintain the same stance he had already. For example, if later on the prosecutor asked him if he had colluded with such entities, leaving out the part about 'against Kolar's interests' he might be forced to say yes, since he technically had worked with Vanessa.