You can win cross races having good technique and mediocre/terrible fitness. Theres a guy in NEO who couldn't even keep up on a Z2/Z3/Z4 tempo group ride with us(we'd drop him repeatedly) late last season but is doing pretty damn decent in cat2 cross. He has really good technique, doesn't overly slow down for every corner and knows how to get over the barriers quick.
Experience man, it helps!