The verticality of the map plays right into the strengths of omen + blind is the best piece of non-smoke utility out of the controllers, hence why omen is played on almost every map. I don't think viper or astra will be necessary, it's more so what other agents will actually provide something better? The map is very wide, having two walls and then a third smokes to float helps both sides. I can see maybe interchanging Kayo, who's just a strong agent in general, in for the third controller, but I just think you need at least two.