I understand your point, but well i play this game since 2009 (season 7), and i do this kind of setup many times to an easy game before a more difficult cup game, and yes the engine can use the backups more minutes than the starters or use them in different position, but never changed the starters (whats the point of setting them then), also in a game that easy (100 points difference) i never saw starter playing 43 minutes unless there is an injury or something, and actually in all this season games wich are similar the starter between those 2 players never played more than 36 minutes. I personally believe that for some reason the starter played the minutes of starter + reserve to get there.
Thanks for your reply!