Alastair Clarkson's ongoing list strategy at the Hawks has come into question as the club faces another bottom four finish.
Cornes ridiculed the club's list management off the back of their fall from grace across the past half-decade.
“If there’s one area of weakness for Alastair Clarkson, particularly in the last six years, it is his influence over which players are recruited to that club," said Cornes on SEN.
“The only reason they are in 18th spot or will be by the end of the home and away season is because of the list management mistakes they have made and neglecting the draft."
"They went the opposite way and now they are paying for that."
Whilst Cornes did not disregard Mitchell's talent, he did go on to question the club's decision to move a high-value draft pick to do so.
“I’m not questioning Tom Mitchell’s form as a Hawthorn player, but what you gave up at that time was the wrong thing to do when you clearly needed to rebuild that list and get as much talent through the draft as you possibly could,” he said.
Cornes also highlighted the recruitment of Chad Wingard, who joined the club in 2018 and is seen as a prime example of poor list management in Cornes' eyes.
“That was the wrong call for where Hawthorn were at, to give up Ryan Burton who is playing unbelievable football for Port Adelaide at the moment, and was at the time one of only two first round draft picks they had on their list,” Cornes said.
“On what Wingard has delivered and the difference between what Burton and Duursma have meant for Port Adelaide, was a massive mistake.
However with the four-time premiership coach reaching the end of his Hawthorn career, Cornes believes that the move is a "good thing" for the clubs future.
“We all admire, we all recognise one of the greatest coaches in the modern era. But if there’s one chink, he’s got a horrible record in the last six years when it comes to list management" said Cornes.
“That’ll be taken out of his hands. That’s a good thing because it’s the one little blip on his record.”
Hawthorn are currently tied on points with 18th-placed North Melbourne with four matches remaining in the season.