We aren't close to halfway, but he knows who's got what and what that means down the road.
I mean, no one knows the outcome, but let's say the coaching staff caught like every possible cue from its opponent. New all the signs, found a fault in their base key schemes offensively and defensively - something you know could not possibly be overcome regardless what you opponent and the unknown provide.
Papa is probably on wires in talks or something like that. Manaforts rolling. Flynn has been toppled and is now jelly in the hands of the investigators. Trump adds another semi admission of guilt - on freakin twitter, which becomes all the more damning in the context of the other facts, actions and his own words and deeds in this case.
You have just rolled them twice on offence once marching down the field, going up 7-0 with Papa. You stop them cold on D, get good field position - BOOM, first play it's now 14-0. Three plays later, their QB sacked fumbles, run in for a TD.
its early, but there's just nothing that will stop the train you are watching. And when you have a real rooting interest, it's not just schadenfraude, you are part of that winning.
And it's 21-0, 5 min into the first quarter, and you know that you've barely broken out the killer game plan.
I see Comeys tweets like this. He sees what's happening as he likely expected but couldn't "know" and he knows that this is the nothing burger part of the investigation relatively speaking. Between his knowledge of the process, the tactics and the facts (some) of this case, I think Comey is having a nice sense of personal satisfaction (it's his rep in the line here really) not only watching, but knowing the worst / best has yet to even begin.