Notably, there are very few teams this year that would prefer to shoot from the outer works. Any team that doesn't score from the outer works can be defended. I think it's going to be very difficult to put together alliances that have 3 outer-works shooters, or even two.
A perfect example of effective defense would be quarter finals 1 at South Florida last weekend. Our team was able to effectively shut down a clearly superior alliance. While we were only able to scrape a single win, I could definitely see this kind of defense swinging matches at championships.
Quarterfinal 1 Match 1
Quarterfinal 1 Match 2
Quarterfinal 1 Match 3
While we did not end up winning quarterfinals, a stronger alliance, with a better defensive robot, could have used defense to pull a victory. I think that, at the top levels of play, teams will be able to capture even with the best defense being played on them, however, if both alliances can reliably breach and capture, every boulder counts.