I think if what we're saying here is if someone.... In plain language, if you go down the road of using the procedures of Bill C-2 as a whistle-blower, then you would stay going down that path, and be subject to the decision that was made there. Then on the grievance side you would have to follow that path down.
Just as a thought, would it not depend upon the language within your collective agreement as to what other actions could be taken? In other words, if you aren't satisfied with the result of your actions or the decisions of the tribunal, you could still opt for actions within your collective agreement.