I disagree. He's been fighting for a while and has a very solid record, and his losses are all to ranked guys. Bisping was a considered a gatekeeper a year ago. Reis' division is new, but if FLW and BW had been around as long as MW had, Reis would be as much a fixture in the UFC as Bisping. He's been fighting top competition for years. His win would be no more an upset than Bisping's either IMO. If anyone's not in the same league, it's Demetrious as compared to the champs my examples beat.
I was just joking anyway -- I'm not superstitious. It is a funny year for this stuff though, and this would cap off the weirdness nicely.