I also don't really think that the villain was particularly great. Namely in terms of how Gant was built up as this big imposing boss, but then as soon as you take him down (with evidence law being relevant for the literal only time in the series, which feels super super clunky and drags out the finale way past when it should have ended - especially taking away from the climax quite a bit), he kind of just says "Whoops! Yeah, guess I'm not great at committing crimes, huh?" and loses the entire effect. I was super on board with Gant as the big bad until the end of the case, where he totally lost his impact and just kinda backed down.
To be fair this was kind of a pattern with AA1 and happened in 1-2 and 1-4 too. Both extremely imposing and influential bosses that were much easier to take down than they should've been. ---