Agreed, that the Mighty Mo vs. Kaennorsing seperates about 5 weight classes.
Mighty Mo has put some well known fighters down on the canvas, seeing his record. He appears to have a really good amateur boxing background and has won toughman for the superheavyweight class. He must be working with some of the best to move from amateur/toughman into K-1 and win against some well known names.
Kaennorsing is no joke himself. Rajdamnern fights are bloody viscious and this guy is really fast. The man has probably taken his fair share of elbows and knees, but can he stay away from Mighty Mo's right hand

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Tale of the Tape (I can understand your reaction!!)
Mighty Mo: 6'1" 280 lbs
Kaennorsing: 5'11 172 lbs
There's a 108 lb difference and in this case, it is mostly muscle
My prediction on this one:
Rd 1- Kaennorsing fights a distance fight, trying to wear down Mo. He lands some smacking hard leg kicks and circles away from Mo's power hand. Mo lands a jab that sends Kaennorsing back about 5 feet

Kaennorsing stings away at Mo's legs and plants a few teeps at the giants midsection.
Rd 2- Mo doesn't waste any time and closes fast. Kaennorsing lands a clinch and starts to knee; Mo plants Kaennorsing into the canvas with a left hook into the body - gets an 8 count as he writhes in pain from the shot. Kaennorsing gets up, adjusts his cup to buy a few more seconds and circles the perimeter of the ring as Mo chases him and misses a few big right hands.
Rd 3- Kaennorsings corner guys throw in the towel to save the fighter from serious damage.