It depends on what you did with the samples. Did you completely re-score (if thats the term) the drums, including adjusting the drummers timing; or did you essentially replace the sound of his drumkit with samples? If you did the latter then it is still the drummer playing, granted the expression will be smoother than he played (probably) but adding compression will do that anyway. I would play the track/s to the band and see what they think. If they are happy then you don't need to let any of the band members know your 'pro' techniques, after all, thats why you get paid to do what you do.
My 2...
