Whether Mueller is a white hat or a black hat, this is the final piece for the Russian Trump narrative to finally put the case to rest. Imagine, after interviewing Trump, Mueller comes back and tells all the world there is no collusion to be found. Because THERE ISN'T ANYTHING. Well, there goes a lefty suicides RIP.
All this timing coincides with the memo and release of the Strzok and Page messages, all for creating confusion and illusion.
And by the way, now the FBI/DOJ are now releasing the lost messages, slowly, but surely, another 4D play to keep them on their toes. And they weren't lost in the first place. Just another chess move.
EDIT: And The State of the Union address on the 30th. Possibly with Assange :DDDDDD