I still believe the voting on the Nutaku side has nothing to do with anything (consider the surveys asking votes for a special gacha...that also included event 5* units).
Today's 2nd aff scene units just happened to include the three units that were included in the pool of bloomable units to date, but just haven't had the blooms translated/released on Nutaku yet:
http://flowerknight.wikia.com/wiki/Category:Bloomed
Treasure Flower from the first batch that included Sakura, Evening Primrose and Water Lily.
Lantana from the third batch that included Cherry and Toad Lily.
Suzuki Grass (Japanese Silver Grass on DMM) from the fourth (and last on Nutaku to date) batch that included Saffron and Oncidium (Dancing Lady Orchid on DMM).