I agree that Stuttgart needs to keep winning their remaining matches in the league if they want to finish in the top four of the Bundesliga table. I think Stuttgart's current form can guide them to win the matches that will make them finish in the top four of the Bundesliga table because Stuttgart has won seven of their last eight matches in the league.
So far Stuttgart is still in a safe position 7 points above the main competitor while the Bundesliga has 8 matches remaining so Stuttgart only needs to win 6 more matches to ensure a ticket to the champions league. I think Dortmund should be careful because they are only one point above their competitors meaning they are not yet in a safe position and Leipzig can take over at any time, Recently both teams have recorded almost the same results Leipzig collected 12 points in the last 5 matches while Dortmund only collected 10 points.
For the relegation zone, we have seen 3 main candidate teams to be relegated Mainz, Koln and Darmstadt who is 6 points behind, it seems that it will be difficult for them to catch up, especially since their performance is still not reliable. As for Mainz, they are trying to recover from bad results, but that is not enough to help them get out of the red zone.