around min 36: The shift in XR size from BB when he's up against CO bet only,prefering a PSB, vs BTN bet (where CO hasn't folded yet), Could it have to be with leveraging SPR's arriving to the river?. I mean, vs 1 player you have to increase the size the pot ott to get a bigger pot by the river, but when CO is yet to react to our XR behind us, there is still a slight chance that CO gets involved by Shoving or cc a small XR? Perhaps the freq of that is so small that is irrelevant and what I said doesn't make sense. The other question that comes to mind is; when BTN face b50 XR, does he ever come over the top?(I am assuming typically not, which in the end still leaves the mistery unresolved, but just wanted to throw some ideas)

too esoteric, would rather see high stakes live play

Cory Mikesell samuelazo regarding the different sizes of raise in situations BB vs CO bet + BTN call and BB vs CO check + BTN bet:
- in the first situation perhaps a small raise is better because CO will be forced to overfold and not to fast play the non nut because there is BTN who has already shown interest in the hand;
- in the second situation a big raise is better because you want to finish HU (forcing CO out of the hand) with the weakest range after the flop action.
This in my intuition.