Satonoko and Onigiri were GP employees. They were assigned to Alteil US at launch, but Alteil US did not turn the numbers they were expecting in the first few months (we actually only missed the goal by like 5% on the most ambitious month... and their goals for the first two months were totally unrealistic because the changes they made inconvenienced players (like account merging) but they expected the numbers to go up from when MB was running it as opposed to down). Anyway, after that Onigiri was moved to a different project, but he tried to make time to help out (on his own time), especially on stuff like ideas for new cards and yes, the ill-fated pre-builts. Satonoko stayed on Alteil but they kept giving her work on other projects in addition --more and more over time-- until once again, her time on Alteil was essentially volunteer work.
Needless to say, when Core Edge was re-created and Alteil was returned to them, Satonoko and Onigiri left GP to go work for Core Edge.
"Scissors are overpowered. Rock is fine." -Paper