Evolt doesn't really need an underling; he alone can easily slaughtered everyone there like what he did to others before.
This time he simply postponing the doom for simple reason to see what will happened if Utsumi, someone who used to be an underling--aiming to be the best 'employee' by betraying people (Sento, Gentoku, Nanba), cornered to such situation; ended up it took no time for him to betray humanity and siding with Evolt.
From our perspective, nothing much changed but it does interesting to see how Utsumi will took his new power.
He's been portrayed inferior compare to Sento (brain) and Gentoku (leadership), will he finally take lead of his own action to amuse Evolt further?
Evolt kinda similar to Ryuk (Death Note) here, bored killing countless lives, now try to find amusement by giving his power to 'chosen' civilian.
Also, Takumi surprised by how he became handsome definitely one reaction audience waiting for, LOL. Good job, Build staffs.
