What I was finally able to see is that if the trigger is not released after the gun is fired or the slide is racked, the trigger bar does not re-connect to the sear, however, the sear is once more holding the prong on the striker in a partially set position.

That is the mystery I couldn't solve, just exactly what was holding the striker back.

I now see that what happens when you let the trigger do a "reset" is that the linear cam on the slide lets the trigger bar pop up and once more engage the sear which is still holding the prong on the striker. That little pop up (click) is what you feel and hear as the "trigger reset".

The sear itself is what is holding the striker back, it just can't be activated until the trigger link is released to re-connect with it.

I was wrongly looking for some magic holder and there is none, it's the sear all the time!