They don't just scale to Olorun. They also scale from Neith who herself is a low 2-C character from having weaved the universe into existence. Athena and Mercury were shown to be on a generally even power as a UNIVERSE MAKER. And from there you scale gods who scale from Athena and Mercury. Ares is even in power with Athena, Anhur shown to be a close match for him, and the list goes on. And then look at Olorun? Zeus and Odin's power were stated to be on a similar scale to his, even if slightly less so. Zeus was only killed cause THREE gods ganged up on him. One of whome was Loki. Loki, with Zeus' thunder bolt, beat down Neith, Mercury, and Athena. Neith, who again, IS A UNIVERSE MAKER in terms of power. Implying that, Zeus may likely be stronger than her. And from there it's shown time and time again how the gods all sort of sit on a similar tier of power to each other, through direct combat, statements, and basic logic.
And I am VERY much against that 7, 4, 2 tiering system, cause, while "low 2-C everything!" Has it's flaws as not EVERY character has been showed or implied to scale YET, the amount of gods that DO scale, with obvious veriances as any tier can have characters who can curb stomp others in their same tier, is FAR too great for that 7, 4, 2 system to make any logical sense. Yemoja and Baron SHOULD scale to low 2-C, among the MANY other gods that do. Samedi blocked an attack from Bellona that was aimed at his snake. Bellona would go on to curb stomp an EMPOWERED Hades. Hades should be on par with his brother at base. Granted Bellona as a war goddess is fueled on combat and conflict, and Hades didn't have the full power of ragnarok in him. She beat Hades regardless. And then later, Samedi is shown in combat alongside Olorun, Hera, Argus, and Horus. ALL of whome were struggling with Persephone's basic vine traps and undead minions. Even Olorun was hard pressed, though he admittedly had the added frustration of a giant three headed death dog barreling down at him.
My point is, not only is Olorun NOT this infinitely infallible being who scales FAR beyond everyone, he and Neith both as universe makers have had many charachters scaled to them with statements and combat, and Neith isn't even a pantheon head. 7, 4, 2 is a flawed system that would only get mor flawed as Hi-Rez piles more and more characters into the pile of those shown to directly scale or are implied to.