Ves had 'created' an unprecedented lifeform.
When Professor Vector Loban initially arrived out of the blue and foisted the Yuri Machine onto him, Ves grew incredibly concerned that he was at fault for what had happened.
Even now, he still did not know whether the Ultimatum lost control and devoured Yuri Enfame on its own accord!
This was part of the reason why he felt driven to 'restore' Yuri's shredded spirit and reconstruct him into a more human whole.
Though Ves made it sound easy, it was actually quite a delicate and challenging ordeal.
People's spiritualities weren't actually made out of intangible building blocks that he could assemble and disassemble at will.
Unlike mechs whose physical components could be swapped in and out with little consequences, any major change to any aspect of a human would induce massive and possibly traumatic consequences to their psyche!