That's mad scientist. All other things the same, decreasing the LSA closes the intake sooner and increases the cranking compression. It's thought that increased overlap "bleeds" (I hate that word) cylinder pressure. Not true. Because increased overlap is generally associated with longer duration, the longer intake duration closes the intake later and that is what decreases cylinder pressure.
Keeping the same duration and decreasing the overlap opens the intake valve sooner. If it opens sooner and stays the same duration, it must close sooner increasing the dynamic compression.
