Because they'd obviously met before:
I'll be especially interested to see how the ghost of Anakin figures in. Maybe he somehow appears to S***-Kicked-Out-Of-Him-P****-Vader after Biggs Darklighter blew him up?
I thought Jango was dead by this point? Maybe one of the clones decides to impersonate him and steals his pajamas?
Man, the more we see about the Force Unleashed figures, the more excited I am to learn how it all ties in together!