If you aren't trying to score, you are stalling. Riding time is a real thing, and as long as the top wrestler is working towards riding time, he isn't stalling. If a position is stagnant, stalemate it. But, you can't really call stalling on top as long as they aren't just hanging on ankles or not returning the bottom guy to the mat. Aside from those 2 situations, it is a logical fallacy to think you can be stalling on top. If you removed the riding time point, you would have a case for top stalling. Until that happens, and it won't ever happen, this is case closed. No top stalling.