Atalanta had the opportunity to play against a very weak team yesterday and that's why they beat Frosinone yesterday with a huge margin of 5-0. Although such a match is very boring to watch, I like yesterday match because a team like Atalanta managed to beat a team 5-0. Atalanta completed 3 goals within 14 minutes of the start of the game and then their opponents Frosinone nature gave up. Atalanta are now in the 5th position of the points table which is a good enough position for them. In the next match they are expected to move up to the fourth position as they are only 1 point behind the fourth placed team.
Atalanta's next match will be against Udinese and Fiorentina will be against Inter. If you look at statistics then it is true as you say that Atalanta will win the match and get 36 points and it is possible that Fiorentina will lose to Inter Milan and they will still have 34 points. Atalanta is almost guaranteed to be in fourth place after the 21st match. I don't know what results they will get at the end of the season but with their current performance I think they are more worthy of qualifying for the Champions League next season than Fiorentina.
Atalanta have another chance to do well as Udinese will be a much weaker opponent for them. But Fiorentina cannot be expected to win the match against Inter. So I also agree with you that Atalanta will get another good chance and they can use this chance to move up the points table. If Atalanta then perform like the last match they might be able to win the match with a big score in the next match as well.