Udyr's potential

When the God King skins were finally shown, it was hard to ignore those amazing spiritual animals, but it was even harder, or at least it was for me, not to think about Spirit Guard Udyr and the spirits that he himself wield.

Udyr is a bit abandoned, thats no surprise for anyone by looking at his model, but he might have quite the untapped potential, as we don't really know how much power can an Spirit Walker harness. This leads me to question many things about it.

-Could the Spirit Walker use the Wolf and Garen Jr?

-Could he harness the power of the Dragon Spirit that resides in Lee Sin? Udyr might be able to, seeing that he is already bathed in flames during phoenix stance.

-Is he limited to natural spirits, or could he channel the power of something less... natural, like for example demons or even more complex spirits like Janna, Kindred, Ornn and so?

-Could someone like Udyr be able to supress the soul of a Darkin inside its weapon? If not to purge it and give it peace, at least to be able to channel the true skills of the warrior sealed inside the weapon, becoming the perfect host or the perfect wielder

-Can the Spirt Walker channel the power of beings from another nature? for example, Voidborns, that should have a soul, even if its a twisted and repulsive one, or even Targonian aspects

-Are the transformation we see in Spirit Guard Udyr the limit? or is he able to transform his body to fully resemble the form of the animal spirit he is hosting?

I don't expect any rioter to answer these questions, but its worth presenting them nevertheless, for people to debate over it and to give a small spotlight to out forgotten hobo