AS far as I understand it, the holiday mode is flawed in that sense that the assistant manager uses the formation but not the exact tactical approach within, not even before he starts with his ingame tweaking. I have tried this myself by taking control of 2 teams, setting up them with a tactic and then let one of the managers go on holiday, letting his assman use the "current tactic". This tactic was with the widest possible setting approach and with the d-line pushed up to max. BUt when I watched the match ( in full), they played with a normal d-line and rather narrow so even the basic teamsettings did not match the direct orders given to him. I then reloaded the save and carried out the exact test 2 more times but both times he played narrow and with a normal d-line