But of course, you know as well as I do, that such a certain judgement--that the Russian effort affected or did not affect the outcome--is impossible. We can argue about it, we can ponder it, but only a very foolish person (including Comey, IF your interpretation in context is correct) would think a certain answer is possible. 

What matters is that Trump won fair and square according to the rules.

Given that, what also matters is whether or not Trump's campaign colluded with the Russian effort. That also is uncertain at this point.