What I got out of Haven for C9 is that they really just don't know how to use their own comp. On haven playing a heavy retake setup on defense is really only possible if you have a breach against a good post plant team like DRX.
Instead of actually providing the support utility and getting more trap setups in on the A side they really just gave up the site every time which doesn't make sense for their comp at all besides zellsis creating space.
What should've is more delay utility and more aggression to contest space on short or long to allow your star multi-fraggers like zellsis, xeppa, or yay to actually have an impact in the round.
imo the calling was the real problem for C9 on haven and icebox and DRX are just too drilled and not scared enough to just sit back and wait.