Would he have been able to see from running? Looked like they were in a wooded area far from the bridge. He wouldn't be able to see through the trees once he ran down.

It doesn't matter at all, but you're making the argument that Kirito somehow isn't taking this seriously and I disagree with both the reasoning and conclusion.

Defeating DG in the tournament only means he can't kill anyone in the tournament. His goal does seem to be to publicly display his power, so that is somewhat of a win for the good guys, but you're definitely right that it doesn't catch him or stop him permanently in any way.