There are still some statements and narrative precedent to say that the disaster curses would still be relatively high tier even compared to other special grade tier sorcerers, like the guidebook saying that Kenjaku would find Mahito and Jogo to be relatively difficult fights (the guidebook also asked if Kenjaku could capture the disaster curses and Gege responded with "in a one-on-one fight, sure" which implies that all 4 may be an even bigger challenge and potentially a loss for him), Kusakabe implying that the guys who engaged Sukuna at the start of the battle (himself, Higuruma, Choso, Ino, and Yuji) were at or below Jogo in terms of power/durability, Kusakabe apparently being someone who can prance with special grades meanwhile he was basically terrified of Jogo and Sukuna's "fight" (probably moreso Sukuna but he still implied that Jogo was far above him too), etc