Sorry that I'm kinda late for this, but while trying to get all of the stars, I found Needle Man, Shadow Man and Snake Man in both Cut Man, Skull Man and Wood Man's stage respectively. I don't have the ability to buy fields from Kalinka yet, but I did scan them both. When I can buy fields from her, will I get access to their stages immediately or will I have to find them again in Fusion battles?

EDIT: Nevermind. I finally unlocked the field feature and apparently, it does work, as Snake Man was the only bot from MM3 that I unlocked and scanned that wasn't also found in a fusion battle and scanned.