The Overwatch League has a completely different meta from ladder.
Before Brigitte was in full swing, Widowmaker wasn’t even in the Top 10 hero picks across all ranks.
Compare this list to what we have now and we can clearly see that adding Brigitte into the meta has had a WILD effect onto everything.
Also, as soon as the OWL gets Hanzo 2.0, if nothing is changed, he will most likely be dominating the league.