19 matches still isn't much. I think many people underestimate how many matches it takes for chance to even out. As said for me, it is more about the playstyle and its indications. I saw them against Dortmund, Leverkusen and Bayern this season and they were completely outclassed in the first two matches. They were good against Bayern but primarily because Kompany only assigned two players as cover instead of the usual three so they could utilize the resulting 2v2 situations to the fullest - still, Bayern should have won that match easily. And so far, they profitted from not being the favorite in most of their smaller matches, IMO. If their opponents start to park the bus like they do against Bayern, Dortmund, Leipzig, Leverkusen and Stuttgartt, Marmoush and Ekitike will have much less space and Frankfurt will struggle to retain possession in a 4-4-2. And once that happens, what worked in their favor against Bayern suddenly works against them and they'll drop points despite having better chances here and there, too
That doesn't mean that they can't finish in the top 4, especially since Stuttgart is struggling heavily and Leipzig fell of a cliff (resultwise, they were shit from the start to be honest). But I have a completely different feeling with them compared to e. g. Stuttgart last season who presented themselves like a true top team in so many games and went toe to toe with the Bayern and us multiple times and did what they wanted with Dortmund.
