The abilities of Mousie included two high-level, four super-level, and one legendary.
Amongst them, the two high-level abilities could be ruled out directly. At first, he was attracted by "Soul Cloud", which was a sort of flying skill. However, after observing Mousie's lackluster flying speed, Gary Smith quickly abandoned the idea.
As for the "Avatar of Soul", that was an even greater impossibility. He didn't possess Mousie's indestructible soul traits. If he divided his soul and subsequently suffered heavy damage, he would be a vegetable at best or completely annihilate his soul at worst.
Besides, he preferred to maintain a single cohesive identity. There was only one of him, and he would not permit even a semblance of another one to exist.