I agree with everyone above - the only thing i can think to add is a fairly rare case (i think) anyway. I'm thinking most people will get into patterns and that's what the counter puncher can be comfortable reacting to.

I was a counter puncher. My most confusing sparring partners did things like switch between orthodox and southpaw. They also did things like gradually shorten their jab to draw me into range without me being aware of it and then of course exploited that. Until I learnt what was going on it frustrated the hell out of me.

I think these are things that really depend on the both participants experience and skill levels. If the counter puncher has seen these things before they probably won't work as well. If the other boxer is sloppy attempting to do these things they'll probably pay for that.