I'm a newcomer to my job and am the only one on my team who has expertise in a subject. Recently, I learned that only a few months prior to my arrival (before the job was offered to me), my team hired an external company to do some of the work that I was hired to do. I had my first meeting with this company, and after asking these consultants questions, it was clear to me that the company has not been thorough in their work, even though I've only been here for a short amount of time.
My immediate supervisor has been gone and will be gone for the next few days, but my supervisor's supervisor was at the meeting, and would like to meet with me to discuss next steps in supporting this consultant's work. Without going into too many details, the desired way to proceed with helping the consultants will likely give terrible results (and thus affect the company in which I work, should the results be taken seriously), as one of the other attendees at the meeting emphasized.
I have a meeting coming up with my supervisor's supervisor very soon, and I'm not sure how to approach this meeting, and how much I should say. Thoughts? Some of my peers (not colleagues) have recommended formulating a plan for how I would do this work myself. Ideally, I would like to be as honest as I can be, but I have no seniority in my current position.