Actually if it doesn’t include the Mirror World, then it’s below Tangram
the entire Rider cosmology, that includes, the Mirror World, Saver System, AR Worlds, infinite timelines, and the other infinite rider universes, etc, would be below normal Decade, who can destroy the entire rider verse and even the sentai world which also contains another set infinite parallel worlds simply by existing,
a stronger version of him, Neo Decade, with the power of the neo heisei riders is way weaker than Ohma Zi-O, getting shot by Ohma in the v cinema. Said Ohma Zi-O in this V-cinema was fusing together infinite worlds with versions of his younger self while being weakened to the point of being reverted to the body of a child and losing his memories.
Ohma Zi-O got rewritten and put into journey to the west as the buddha by Asmodeus in super hero senki who again, is below Senki Saber.
If you really want to do infinity scaling, Tangram and Othinus would only be equivalent to 1 of those infinities since both only govern infinite worlds, TMG's and above would be equivalent to 2 of them since there infinitely above Tangram and othinus, That'd still put them below Decade who scales above 4 infinities, the infinite recursion of the mirror world, the saver system, infinite parallel worlds/timelines, and infinite future riders, who then gets outscaled by two other characters.