You start from a false assumption. There is no need for any "multidimensional timeline" or parallel universes to account for possibility, there is only one timeline for the Aurbis and having infinite possibility wouldn't change that - without this need your idea completely falls apart.
Godhood is to know endless possibilities while knowing "them"
He's saying that if you have CHIM there are no longer (or never really were) any 'them', hence I ARE ALL WE. 'They' only exist in their illusory reality (the one that Akatosh is maintaining), one that has no bearing on the individual with CHIM and it doesn't really matter what 'they' perceive because 'they' are an illusion.
Apart from starting with a false assumption, your other problem is that you're shifting back and forth from the reality of the one with CHIM and the reality of the world. Within the reality of CHIM the reality of the world is an illusion, meaning you can't shift back and forth between them with any overarching theory. You can't talk about the perspective of one with CHIM while talking about the perspective of a "them" at the same time because one negates the other. Timelines and dimensions don't apply here because they can't cross that barrier...
Its not that anybody opposes discussion, but when there are obvious faults in a theory they are going to be pointed out. The alternative is to just ignore the faults and carry on the discussion in spite of them however any fruits of such discussion would be worthless because they would be knowingly based on false grounds... besides, you defending your point counts as discussion, and really the only way to clear out problems in a theory is to have to defend it - its the only way to get to the meat.