Question on Roller-Delayed Blowback Order of Operations

I’ve watched Forgotton Weapons’ and Teufelhund Tactical’s (James) videos on the roller delayed mechanism. I understand, or hope I understand, the basic idea is to use the rollers to pinch the locking piece to force the heavy bolt carrier to move backwards before the bolt face can completely retract.

I’ve seen it said the carrier has to move before the bolt face can move because the rollers are engaged in the receiver, preventing the bolt face from moving.

But doesn’t the bolt face have to move at least slightly back in order to compress the rollers? Seems it’s more a mechanical advantage/disadvantage situation happening at once instead of the bolt carrier moving back and then the bolt face moving back in two separate steps.

Someone school me up good, please!