Quoting: Fail4Nail
Why? Jenner is 30, age where power-forwards decline. His career high in points is 49....
Mittelstadt had 59 points last year and is on pace for almost 70 this year. Not to mention he's only 25.
I think CBJ fans are overvaluing Jenner a lot...
Jenner is a rare defensive-minded, faceoff-winning, goal-scoring machine who, despite being regularly hurt (this year was a fluky broken jaw) is generally a lock to score at a 25-30 goal pace and 40-50 point pace
while doing the other things, and the organization loves him/he's the captain.
Mittelstadt is a one-dimensional offensive talent, who is primarily a playmaker (a decent one) but not a play-driver. He doesn't play a great two-way game, and doesn't score a lot of goals. That's not as difficult a player to find as a Jenner-type. He's finally having a true breakout season during a contract year. What's his next contract going to look like, $6M?
Hockeyreference has them at remarkably similar xGF differentials, but Mittelstadt gets the edge in on-ice shot differential. Jenner's career FO% is almost 10% higher than Mittelstadt, both have similar SH% and Casey has the lower ATOI.
What it boils down to is this: they're both decent 2Cs better suited as a 3C/3W with two totally different playstyles. One is a well-rounded known quantity and your captain on a cheap deal with 2 more years that the organization values extremely highly (re: "overvalued"), but is likely to decline soon. One is an unknown quantity playmaker who is probably going to demand significantly more than Jenner in the offseason after a breakout couple of years that may not be sustainable, he may improve; he may sustain; he may fall off a cliff. If he falls off a cliff, you're stuck with an expensive bottom-6 winger (yes, winger) who plays a top-6 game (re: "buyout candidate").
Jenner's a known quantity that will decline soon, but is still extremely valuable internally and externally. Mittelstadt is a buy-high candidate with high-risk and low-reward at the price. I think it's a "devil you know" situation, and Columbus passes.