In the current spec, Lot 1 (S-92A) is 8 rescued persons, 2 of whom are on stretchers. Lot 2 (AW189) is 4 rescued persons, 2 of whom are on stretchers.
You could do 6+2=8 in the AW189, and of course it has turned out to have good range and endurance, but it would be a hell of a squeeze and winching those in would be a struggle. Also a struggle to do any proper work on a patient in that cramped situation. H215 and 525 are hot'n'high-winching-capable but not really any bigger. You end up looking at the S-92 (and the B is coming of course) whatever way you slice it, unless you have a Norwegian sized budget!!!