>>718460054
As much as I don't like several things NG4 is going for, the lack of all these girls is not out of norm, the vanilla release for all mainline NG titles follow a formula: Ryu alone + new cover girl assisting him. The girls were brought over on expanded releases and have been so since Sigma.
NG4 has replaced Ryu with Yakumo and the cover girl this time is Seori, the formula still applies. Although Ayane was a consistent minor cameo even on vanilla releases, if she doesn't appear for at least a few seconds the formula will be broken a bit.
Thus, the girls galore is only for Njnja Gaiden 4 Sigma / Black / Razor's Edge down the line.