What's so hard to understand? With the UC collection, UC4 comes out at a certain time, and that's how things work. Without it, it's pushed up slightly, definitely not to when UC collection comes out, but still slightly sooner so that there's a smaller gap than if it had come out at the time it was previously going to come out, and because less time is spent here, everything afterwards gets pushed up the amount of time UC4 is pushed up. Let's say it comes out say in December, then work starts on the next game in earnest in Feb-March. If it's pushed up to, say, October, then work begins on the next game in Dec-Jan., and that carries on to every other game that that studio would make, which means that there's a good chance of at least one more game coming out during this gen, for this console. This simplifies reality by just assuming each game takes the same amount of time to come out, and it removes outside factors, but the same principle still applies.