The Eagles moved on four draft picks - including two first-round selections - in order to acquire Kelly's services as they looked to build on their push for a premiership.
The Cats received picks 14, 24, 37 and future first-round pick in exchange for Kelly, pick 57 and a future third-round selection.
Cornes put light on the Eagles' scarce income from recent draft years, which he believes has stemmed from the huge 2019 trade swap and will hinder the club for years to come.
“They’ve got it wrong,” Cornes said on Footy Classified.
“You could see it coming from a mile away.
“They’ve had one first-round draft pick, Jarrod Brander, since 2017. Other clubs are going all out and getting two, three, multiple first round draft picks.
“The Eagles have neglected that because of the Tim Kelly trade.”
While the Eagles haven't been as present as other clubs atop the draft order, they have been able to land bargain recruits later into the night's events.
The Eagles are facing an uphill battle to add a fifth AFL flag in 2021, with some believing the club should concede their premiership window is closing and look to the future.
West Coast have been urged to consider moving on gun duo Gaff and Yeo to bolster their draft hand for the future.
Despite being on the verge of locking in a seventh straight finals series, the Eagles are placed well behind the six clubs above when it comes to their premiership credentials.
Adam Simpson's side have the chance to send a warning to the rest of the league as they host premiership contenders Melbourne in Round 21.