Someone in Japan probably felt something similar to you when he/she saw the Seige on Cybertron set, thinking "What?! If I want Metalhawk, I gotta buy another Ginrai?! Damn!"
Unless they plan on re-releasing these characters in the future as stand-alone figures, it sucks for Masterforce fans; because if they want Metalhawk, Minerva and Cab, they'll end up buying multiple Ginrais (unless they trade for them or buy each individual component off eBay). To top it off, they're in two different exclusive sets for two different markets.