I think if there is a tie among highest quanta pools, it should generate 2/3 randomly among those tied.
The reason tie=no generation is to avoid Nova abuse. 1 Nova = 2 Butterflies, which leaves 1 quantum in 2 pools; perfect for an aggresive start as the butterflies would each generate 2 quanta. Rainbow rushes are powerful and this card is meant to encourage duo/trio builds.
BUT their mark will generate 1 quanta. Which would make the butterfly generate 1 mark quanta, that's it.