Similar deal happened when I was young like you look to be, found a primo musky lake with one friend, we each took another friend, I took family, and in a couple years it was a mad house and the entire local fishing club was there every weekend (3 hours drive from home). Turned into a royal circus! It sucks, and I think we all learn as we go in life. Since then my circle has gotten quite small, one small crew that shares fishn stuff, one real small crew that shares huntn stuff. I pretty much wont take anyone to an area if I'm not OK with them telling their friends cuz I know they will anyway, even if you ask them not to. I trusted a guy from church last year and that even bit me, guess I am still a slow learner. Sadly you are just going to have to put the total ignore to C and hope he gets the hint, or flat out tell him that you think 4 guys is enough, which in my opinion seems like 1 too many already. Best wishes!!