While they've over performed they have age on their side. Judge, Sanchez, Castro, Hicks, Didi are all pretty young. Their BABIP is way too high but I don't see a huge regression coming.
Donaldson is by far the best hitter of both teams but 2nd base is a disaster with Travis out for a long time. One thing that hasn't really been talked about is how bad the Blue Jays defence has been. And while JD and Tulo are back they still don't look like the defenders they used to be (injuries could be holding them back). Add in the fact that Pillar looks a step slower and Bautista/Carrera gong shows and what looked to be a strength is now a weakness.