Re: Vertical Two queen hive - Top entrance or not?
My experience with a vertical two queen is they have a short life span, 2 or 3 months and it is a 1 queen hive again.
If your goal is to separate, than run upper entrance so you have field bees trained for the separation.
I don't think they will build down well, top of the frames first and then very slowly down, but your bottom bees will build up, top entrance or not.
It is not true that you cannot teach an old dog new tricks.
They can learn them, they just can't do them.