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At least all ST's aren't ecores, which I don't care for. I thought just the big filters were non-ecore now. I guess not.
With a few exceptions, the greatest majority of 3" or greater dia. ST/STP oil filters are ecores. Been that way for some time.
It's still my opinion based on my 7317 dissection, that looking down the centertube out alone is an unreliable method of trying to determine which slits/holes are open, or which are supposed to be open. As the pictures on page 4 show, the slits in the 7317 centertube are consistent and plentiful. Now, are they as intended by Champ, only they can answer that.
I do agree with Pete C's comment on other thread that the direction of the openings, facing base or thread end doesn't matter. That could account for, "if" the pictures are accurate, the difference between the 7317 dome facing slits and the base facing slits in the shorty version 6607 posted on page 3, centertube just turned in opposite direction. That said, not convinced from that picture that the slits do face the outlet, or which slits are open. As also shown/posted previously, shadows from flash/camera angle can falsely make some appear open and others not.
Lot's of speculation but at this point, I think only Champ can address whether the centertube is as designed.