Yup, in that case, I agree with you. This goes back to the old days here in the MRB boards, where I was the one that said basically what you just did and was called out for it. But, I also believe that while you (a general you) brew it, it is "yours", but it is not really, unless you created that recipe. Otherwise, you are just brewing someone else's beer (much like using someone else recipe to make pies). Same goes for a clone. How it started back then is I brewed a friends porter recipe and I called it his porter and I got ripped for that. I stand by my comment even today as I fully believe in giving credit where credit is due.
If the recipe came from a direct friend, then yeah, I would say brew it and enter it as long as that friend is golden with you doing that. Where that came from, I agree with you on not doing that. Very understandable.