Rick,

Not true mate, the optimum time for fuel injection with sequential injection is when the valve is shut as this aids fuel atomisation through injecting fuel onto the hot valve. The exact optimum timing for injection differs with rpm but it is never with inlet valve open.

In addition you are incorrect about the lack of time to inject. Sequential can also have as much time to inject as batch fire as it is possible to hold the injector open for virtually the entire 4 stroke cycle when seeking maximum fuel flow.