I suspect Meuller realizes that there's nothing there...
Wed Nov 1, 2017 9:09am (XFF:

...and instead of just calling the whole thing off he decided to toss some irrelevant crap up on the wall to placate the ignorant anti-Trumpers.

Collusion between Trump and the Russians has become a religion to them.

They have faith, which by definition means belief without evidence.

Indicates a weak mind, easily led.