I think it's pretty obvious he had almost zero involvement.
So they left 18 Democrat lawyers to spend a couple years digging into Trump and the best they came up with was no collusion, and maybe he obstructed justice but they didn't charge him because it's unclear / hard to prosecute obstruction of justice if no underlying crime was committed.
What a fucking disaster, now to tie a bow on it Horowitz will finish up his report and a huge swath of the FBI and Obama DOJ will end up in prison.
At this point:
Trump charged/impeached +400
Comey charged -650