I confirm this. I was meaning to post the same observation myself. I tried different test games to check this, medium tensions, and high tensions, playing in favour of "blue" or in favour of "red" (but never the sphere leader), played active part in scripted wars, completely ignorred all wars, and no matter what I do I always end up "Blue" as the rest of the world...after some time that USSR is the only country in the red sphere, in the '60 some coup may create another red member but it doesn't last long, couple of years max.
Something is definitivley "fishy" because even when I tried all possible to advance the red sphere (but not playing USSR) I always ended up in the blue sphere around '60s. And when I say "all possible" I mean, no diplomatic contact whatsoever with blue members, no trading with blue members, condeming everything blue members did (I know this has no or close to none aspect on relations but still...), trading activley with red members, assisting red members in scripted wars, etc. and still, slowly but surely I would become first unaligned and then after some time blue EDIT: I must emphasise that when speaking of "Blue always wins" I was referring to sphere alignment shift not wars wining.