Can beings, that are neither 50% STS, nor 50% STO ascend

[Sacred Fool]

 

Another way of viewing this (internally, not using externalized percentages), which is kinda-sorta alluded to above, is to look at your own patterns when you are under stress.  The stairs of light experience is inherently stressful just because you will "ascend" into stronger and stronger light and that will make transparent all your hidden fears and anxieties, feelings of unworthiness, shame, terror, etc., etc. 

So, when you are under stress, do you turn towards love and freedom or do you contract and hunker down?

My guess is that, whether one is STO or STS dominant, it's the internal clarity of one's inherent energetic devotion to the service of spiritual being (as measured under stress) which will be the determining factor of how much intensity of Divine Light one can feel comfortable merging with...either when living or post mortem.

If the translucency of 4D causes you to contract your own light, then you may find you need more rough-and-tumble 3D experience to bring you to the point of doing the miserable work of deep self knowledge, acceptance and love.  That is, doing the deep-reaching surgical work of splitting your own self open to discover Divine Love/Light dwelling therein.