It is quite something for a writer to give away the twist to her own villain. One must wonder if Ms. Evan Stanley simply could not help herself.
She appears to be attempting to write a character with a dissociative condition, but one gets the impression that she either lacks SEGA's approval or has not decided on the character's direction. This all but confirms the "blobian" was the real Mr. Lunar, which renders any potential mystery completely inert. The character is now fundamentally uninteresting.
Furthermore, Ms. Stanley seems to lack the creativity for a more interesting depiction. Instead, we are given a reductive binary of "master thief" versus "confused child." It is a terrible and simplistic portrayal.
It seems quite clear that Ms. Stanley is just creating another Ms. Belle. She is crafting a character who exists only to be pitied and to mope about, a character with no real potential for interesting stories.