This was simply a matter of time from the beginning with Oliveira offering very little to Edwards in any portion of the fight. Once Edwards was able to determine which combinations worked at the appropriate distance, it was really over.
The win is important for Edwards more for job security and mental refreshment than anything else. But for Edwards, that's probably enough today.
There's also an issue of whether or not the fight was stopped too late. I believe it was, although not criminally so.
Here's our live blog of the end of the fight:
Round 2 Edwards lands a left. Inside leg kick. Another. Edwards lands a jab. Oliveira lands a kick. Oliveira charges, comes up empty. Oliveira charging after Edwards. Connects. The pace slows. Edwards hurts Oliveira with a hook. Oliveira falls. Edwards pursues him down, landing shots. Edwards with a knee. Oliveira gets back up! Edwards hurts him again. High leg kick hurts Oliveira and he falls down. Edwards follows him down and lands a torrent of punches. Edwards takes his back, the shots continue to rain down.