Aeyu's suggestion:
For Simon:
AP: High Complex Multiverse level (Defeated the Anti-Spiral, who created a Super Spiral Universe in the imaginary space between the 10th and 11th dimensional brane universes, corresponding to a 10+1 dimensional reality. Superior to Super Tengen Toppa Gurren Lagann and Tengen Toppa Gurren Lagann, who were themselves composed of (look on old profile for the scans for this) a single Super Spiral Universe and several Super Spiral Universes, respectively)
For the Anti-Spiral:
High Complex Multiverse level (Smashed Tengen Toppa Gurren Lagann, a being made of a Super Spiral Universe, through multiple galaxies. Able to directly match Tengen Toppa Gurren Lagann, even after the latter absorbed the Infinity Big Bang Storm), can ignore conventional durability with Probability Manipulation | High Complex Multiverse level (Was able to destroy the drill of the STTGL, a being made of several Super Spiral Universes who was vastly stronger than TTGL, and tore through every mech within until Gurren Lagann's drill defeated the Super Granzeboma) | High Complex Multiverse level (Able to maintain and control the Super Spiral Universe, a Brane universe manifold between the 10th and 11th dimensional universes, corresponding to a 10+1 dimensional reality)
STTGL:
High Complex Multiverse level (Directly matched blows with the Anti-Spiral's Super Granzeboma, which was powered by the Anti-Spiral's maximum power, although it inevitably was defeated in a Giga Drill Break struggle. TTGL has been stated by Gainax to possess an entire compressed Super Spiral Universe within it, which is a 10+1 dimensional brane universe. STTGL is noted to contain several within it), can ignore conventional durability via Probability Manipulation
TTGL:
High Complex Multiverse level (When forming, Simon states that their intention [in the Super Spiral Universe, both intentions and thoughts become reality] transcends both space and time, as well as dimensions, and that they will fight against the will of the "infinite universe". Able to fight competently against Granzeboma, though they are inevitably outclassed, with them in the movie splitting down into smaller parts before the formation of STTGL. Additionally, Gainax has stated in an interview that TTGL possesses an entire Super Spiral Universe within itself; which is a 10+1 dimensional brane universe), higher with the Infinity Big Bang Storm absorbed (Exceedingly more powerful than before, and can match the Granzeboma in power. When pushed back, Simon states that his drill will "break through the universe," allowing his friends' dreams to aid him, further increasing the power of TTGL) (BTW with TTGL, the tiering should just look like (at the top) High 1-C, higher with the IBBS absorbed)
Lordgenome:
High Complex Multiverse level (Comparable to the other Tengen Toppa Gunmen, albeit to an unknown level, who in turn are comparable to TTGL, a construct which possesses a Super Spiral Universe within its body. Said Super Spiral Universes are 10+1 dimensional brane universes) | High Complex Multiverse level (Able to facilitate the creation of the Super Tengen Toppa Gurren Lagann, which, along with most likely containing multiple Super Spiral Universes within its structure, could also, at full power, absorb all the galaxies, matter and energy within the Super Spiral Universe, including the Extradimensional Labyrinth, a realm containing thousands of parallel universes)