theres only a handful of situations.
either together they are balanced.
together they are too strong.
or apart they are too weak.
if they are balanced together, then they cant also be balanced separate.
if they are balanced without eachother, then they must be even stronger together.
there is no winning situation unless its conditional that you play the two together or not at all.
if you want them to be balanced without eachother, then by extension together they must have the slightest of meaningless increases or else its disgusting not to be together.
basically its going to become > 55% together and < 45% apart (win rates). you will never get them close to 50 together AND apart without meaningless bonuses.
whats GOING to happen, is they'll be released together OP, and slight nerfs to be something along the lines of 52% together. and olafd under 40% separate. (my bets is sup is going to be really really weak and the adc will be a bit strong both separate and together, will be more workable in other comps than the support will be)