I agree with you on this - although I feel like either could win in a match, but Clark got the last laugh.
This logic should work both ways, although most of the times the "fan" in people don't allow them to see this.
Personally, I try not to weigh one, or the most recent tournament, too heavily. In the matter of Clark/Gulibon, I would be of the opinion that they are of similar ability and have difficulty picking between them if they would meet again (I don't think they will). To use an another example, I would still rate J'Den Cox above McIntosh, and probably have to pick Cox in a rematch if I had a gun to my head (although in any other circumstance, I'm picking McIntosh).
But I get the other side of the argument.
For me, most matchups I like to rate with the "10 matches." Really hard to beat a wrestler 10 times in a row even if you are clearly superior. Gulibon/Clark - 5 to 5, maybe you could argue 6 to 4. Cox/McIntosh - I still got 7 to 3 Cox right now. Gilman/Conaway - I'm thinking 8 to 2 or 9 to 1 although they are close. Nico/Gilman - I'm thinking the same thing.