There is logic, and the distinction is obvious for even the most casual follower of footballer who understands tactics
https://global.espn.com/football/lineups?gameId=558874
https://global.espn.com/football/lineups?gameId=560372
Based on the link I posted above, there is a clear disparity in the quality of the resources used for the Liverpool game vs Aston Villa in the Caribou Cup and the resources used in Liverpool game vs Everton. Neil Critchey (Under-23 Liverpool coach) was in charge Adrian was in goal for the Everton game, and Gomez organized the Liverpool defence; added to the fact that Minamino (established professional), Lallana (established professional) and Origi (established professional) started for Liverpool).
The distinction between the Caribou Cup game and Liverpool game is quite clear and obvious.
Who were the established professionals that started for the Aston Villa game?
Also, have you forgotten that Ox came on as a substitute for Liverpool?
To help you, if Liverpool had put out the same lineup that it had for the Aston Villa game, there would have been a strong likelihood that Everton would have advanced.
Again, it would be expected that a full team with professionals would EASILY dispense with academy kids.
As for the game last Sunday, if Everton were more clinical in the first half, the game could have been different, with Klopp being forced to make changes to prevent the tie from getting away from Liverpool.