The IG doesnt ct!t all over Cubes; a lone CCU overtook Eternity without Eternity being able to do anything about it; atleast Eternity resisted Thanos with the IG...
In that novel that Mr Master referenced in a different thread, a lone CCU performed an omniversal feat...which is beyond anything done by the IG as well.
So no, even as pertains meaningful things, Cubes have better feats than the IG...
As pertains the Cubes never being present during a major crisis, the Pheonix Force (or the Inbetweener) is never present as well, so using that as "evidence" is dubious as writers are rarely consistent anyway...
As concerns the LT and "permitted," judging by how powerful the True Beyonders appear to be (based on a tiny fraction of their power being enough to create objects of infinite power like the CCU's), I dont think he could stop them anyway...
Do you have any proof that the True Beyonders universe falls under the jurisdiction of the LT?
Feats mean NOTHING in and of themselves without fights to back them up. Four Thors shored up the fabric of the MULTIVERSE with their Godblast.
When did Thanos overcome Eternity with a CCU? I want scans, I don't want scans of him becoming one with the Universe using a CCU, I want to see him using the CCU to overcome Eternity in a fight on panel. Hell the AO became one with the universe and he's a crotchety old man.
The PF is all over the place power wise and it's almost never (if at all) even seen outside the X-books or their tie ins. Maybe the writers feel it's not on the level of true cosmics? Regarding the IB he WAS there when the LT summoned all creation to go up against Thanos with the HotU, the Cubes and CCUs were no shows. He couldn't' have been there for the IG fight because his masters imprisoned him for attempting to defy them (as seen in Thanos Quest that led up to the IG affair).
Their universe is within the multiverse and was on Kubik/Kosmos' tour of creation. Kubik himself said there is NOTHING and no one above the LT save his master (this would include the true Beyonders).
__________________
..even the outer hells are indifferent matters for they bow only to potent and archaic Nodens.