in fb/fcp defense is actually more important, at least if you are talking champion-seeking levels, than in the regular press. mediocre defense can be tolerated on some players in regular fcp because it doesn't cause a huge hit to fg%, but it does have a very significant effect on fouling. in fb/fcp the foul/fatigue combo is so severe, that low def actually hurts more. not to say you cant afford mediocre defense in a couple high scorers or whatnot, but in general, the defensive rating is pretty highly important in fb/fcp.
it does depend what level you are competing at, though. on regular press teams more in the 2nd round level, like a mid major, defense is where i make a major sacrifice, but a large part of that is that all the top teams prioritize it so much, i have no way to get a lot of it even if i wanted to. so it just kind of depends. the more competitive you are, the more those volatile high fatigue high foul situation matters, and the more the defensive rating itself matters.