I think sometimes he will play very good and sometimes not so good - you are playing a person that may be worried, tired, not so focused as usual, etc. The best athlete doesn't win the race every time, only when he's at his best. Kernel Mustard was #2, has beat Hielco two times, and now he has trouble getting back to 900 rating. So I think it's unfair to say that he's a pure lotto player just because he played one poor game against you.
In my experience, if someone lottos me one time, they'll lotto me the next and so on. With the exception of some lower ranked players whom are "scared" or "intimidated" by someone at this rank and lotto, most people who lotto do so because it's their way of playing.
90% of the "lotto players" in the silver rank have multiple accounts, play normal with one account then switch to the next, hope to match upto you again and lotto your setup. It's a major problem.