that's a management consultant, and the reason they're hired is to provide cover and credibility for both management and your technology team.

i.e., "the expensive consultant said it was okay, so don't fire anyone in management, or our technology team, if it goes sideways."

in other words, they're actually helping you do your job because they can compare your recommendation to other companies and teams in the industry and make sure everyone is doing things sanely. in your case, you were smart, and made the right recommendation, so they agreed with you. good job, you're competent, and aren't putting an established company into a risky situation like you would at a startup, which generally does not hire consultants, because they have nothing to lose and everything to gain.

you probably didn't see it that way, i'm guessing.