I believe Stuttgart will manage to qualify for the Champions League group stage, what is your opinion? I know there is a good progress in Dortmund and Leipzig's form recently as well but a gap of six points is a really good advantage for Stuttgart to make it.

Stuttgart must be able to maintain its consistency until the end of the season if they want to get a UCL ticket next season and definitely not lose points in the several matches they will play in the future, the difference of 6 points can actually still be caught by Dortmund or Leipzig if Stuttgart doesn't play consistently and loses points suffered defeats in the last few matches at the end of this season, I don't really know much about the strength of this team but I see they have good statistics and consistently stay on the winning track.
These statistics must be maintained until the end of the season, although in several matches towards the end of the season Stuttgart will face several important matches which may be quite difficult, namely facing Dortmund in April and the rest against Leverkusen and Munich, of course these are tough matches but if Stuttgart is able to maintain consistency at least a draw would be very good to maintain their position, at least they beat Dortmund in the April meeting so they can maintain the point difference so that it will be difficult for Dortmund and Leipizig to finish in the top four of the standings this season and shift their position.