Welcome is a kind of underperformer because it got a cult status just half a decade later of its release. It was released when Akki was the top star but even with everything on its favor from music to starcast to the most important thing content its just a superhit. If released today it could end up being a huge BB.
In addition to that it was demoted by BOI from blockbuster to SH.
I think it was partially affected by another SH released with it TZP or comedy movies do have some restrictions when compared to action or social daram movies (which I think we ignore most of the time). This I think is the reason why there is not even a single comedy movie earning over 210cr.