What a strange topic...
First, you don't want Pre-Retcon Beyonder. You was SW2 Beyonder.
Second, there is no such thing anyways. SW2 was poorly written... Everyone's power levels fluctuate so badly it hurts. It's not even clear whether the Retcon was intended from the get go or not because none of the cosmic entities made any sense. Seriously, the comic makes MUCH more sense if you assume Beyonder is a loon and the big wigs are just playing along with him than anything else.
Last Planet Standing isn't cannon, not even to LT. None of the What Ifs actually are... What Ifs, Ultimate, whatever have no bearing, even on LT. The several M-bodies only applies to canonical dimensional travel stories.
Marvel Universe: The End is out of continuity. Confirmed by Andy Schimdt, current marvel Editor in charge of space.
Infinity Gauntlet does not instantly grant the wielder its full abilities. Similar to Beyonder's powers, it takes some work.
Cosmic Cubes are WAY below the Infinity Gauntlet.
Infinity Gems are odd. While the main six theoretically exist in every dimension, the seventh gem is unique to the multiverse...
Their power is, however, only below LT's and nothing else.
Phoenix SCARED the cosmic entities more cuz... Well, supposedly humans will evolve to replace the cosmic entities, and Jean represents a giant step torwards that. Most fans and writers ignore that story on the account of it being retarded.
Death can't really be killed by conventional means, regardless of power. All Beyonder did was make people immortal, which is the only true way to destroy Death.
Using SW2 Beyonder is akin to using Thanos for that one pannel where he replaced Eternity and was all powerful. It's silly and pointless. You have to accept all that came before and afterwards...
