You're asking me to answer a hypothetical that I'm not sure I can completely answer. But it seems to me that with a proper investigatory power, which has to be properly resourced, then you are not just able to produce the kind of investigation and documentation that enables a reasoned response, but you're also able to satisfy all the parties—corporations, NGOs, civil society—of your credibility and legitimacy.
And it is crucial that whoever does this is sufficiently resourced and sufficiently skilled both to do the job competently but also to secure buy-in; that is, a feeling of credibility and legitimacy between both corporations and civil society. It certainly will not do to only have the approval, as it were, of one or the other of them. And that requires, certainly, an investment of energy, resources, competence, and so on, that have to go into things like investigation. And those, in my experience doing that, require expertise, independence, and resources.