Nightshades come with the pole piece plug that is conical shaped to direct the air coming back down the cone around the former instead of just out through the pole piece. SA Series motors used the same plug except with a little hole in it to provide a tiny air flow through the pole vent. Thats only Sundown products of course but Sundown has sold those pole plugs to people on here with other motors as well.
If you dont believe then Email Jacob at Sundown and ask him. He owns the company and he uses the technology so if you're doubting me when you're the noob then maybe he can set you straight. Post the pictures.
EDIT: And i wasnt saying the pole piece on the Alpines was the same as sundown, but im saying with it not being vented, it provides better cooling than a free flowing vent, i believe you confused what i was saying.