It all depends on how you interpret Molecule Man's,
and a Cosmic Cube's, power levels.
In my opinion, a Cosmic Cube is nowhere near as
powerful as a Celestial. Iy's powers are mostly
illusory and temporary, and they don't extend much
beyond Earth.
Molecule Man is basically half a cube, or let's say a
full cube, with an advantage due to greater human
imagination. He's formidable on Earth standard, but
he and his Cosmic Cube-level powers are nothing
compared to a being who functions on near-galaxy
level.
Molecule wins a guy with a strong will could basically do anything with a cosmic cube just like Thanos. And Mephisto said that a cube full potential is like IG
__________________ The whole problem with the world is that fools and fanatics are always so certain of themselves, but wiser people so full of doubts.
Infinity Wars. Magus stole cosmic cubes from different realities and put them into a machine. It's probably more than five cubes, but I'm too lazy to look for it in my book. He used them to put Eternity into a catatonic state.
This starts a series of events, one being Galactus asking LT to reverse his edict on the IG to allow them to be used in unison once more. I think it was to use the IG to free Eternity or something - all part of Magus' plan.
Why LT didn't free Eternity I don't know. I'm missing like two issues of IW so it might've been explained somewhere in those.
I thought this whole "masterplan" of Magus sucked big time. He had cosmic cubes, and what does he do ? He involves Thanos, Galactus and almost every major hero because he "likes to play with them, and likes to confuse them."
How stupid can you get...? Of course he got his ass beaten...
__________________ The whole problem with the world is that fools and fanatics are always so certain of themselves, but wiser people so full of doubts.
Tricking Galactus into asking LT to reverse his early edict and succeeding? That's better than Thanos going after the gems after talking to the Infinity Well.
He had Thanos and Warlock gunning after him. All Thanos had was Warlock and that's after Thanos had gotten the IG.