Wait. You really believe Microsoft moneyhatted Cave for the 2D shooters?
I have no idea which incentives were given to which developers and if Cave did receive anything, but I have no doubt incentives were given, leading to 2D shooters coming to 360 early on. Which led to most of those small 2D shooting developers who lacked resources to support multiple platforms to go to 360. Which in turn led to the result I described before.