I just watched a video and discovered that you can fuse with other members other than Donald and Goofy.
And I got proof:
http://www.youtube.com/watch.php?v=HhWEMvD8Pzo
Apparantly for Masterform, he fused with Donald and Beast.
And I got proof:
http://www.youtube.com/watch.php?v=HhWEMvD8Pzo
Apparantly for Masterform, he fused with Donald and Beast.