the only way is to review the past games of your next opponent, go back at least the last 5-10 games to "detect" his enthu.
if your opponent always plays normal, then in one match result you see that his opponent put more in that game, that must be CT vs your next "scouted opponent's" normal, thus his enthu is still ready.
if your scouted opponent always uses TIE ( you always notice in his last 10 games that his opponent always put more effort then just count the number of games from the time you notice that result and add to 5 to estimate his enthu
example you start detecting " his opponent put more effort" in the last 6 games, then you could estimate that his current enthu level must be 10 to 11 already