Not gonna lie, the thought of Aqua Force being the best deck in a double Link Joker format feels wrong to me. But I guess that as long as one draws enough resist G2s it's actually doable.
That and Thavas can push right from the start before decks like Chaos and Overlord can stabilize. Resist Force was just so much faster than everything else when this set dropped in paper that it was the measuring stick for how good a combo deck was in GZ format (Harri Stride wasn't out yet) as more than once someone would say "but is this deck as good as Thavas?" That question was eventually answered by Victor a few sets later.