The former US Open champion won the Sentry Tournament of Champions in Hawaii over the weekend with a comeback for the ages when he overhauled Collin Morikawa's seven-shot lead in the final round.
Having also won the Spanish Open and DP World Tour Championship, former number one Rahm was hoping to at least move past Patrick Cantlay into fourth spot but still finds himself in fifth place.
"Since the playoffs...I've won three times and I don't even get close to him. So I'm trying to understand what's going on," Rahm said.
"Had they not changed the world ranking points (system) I would have been pretty damn close (to world number one) right now. But in my mind, I feel like since August I've been the best player in the world.
"Earlier in the year clearly Scottie (Scheffler) was that player, then Rory (McIlroy) was that player, and I feel like right now it's been me. Anybody, any given year can get a hot three, four months and get to that spot."
Last year, Rahm had described the revamped world rankings system as "laughable" when priority was placed on the depth of the field rather than the ranks of the players involved.
McIlroy remains at the top of the rankings followed by Masters champion Scheffler, Open winner Cameron Smith and Cantlay.
Rahm still walked away pocketing $2.7 million from the $15 million purse in Hawaii.
