A crank trigger (like the MSD) doesn't pulse any differently on a particular pulse versus the other three on its wheel, so how is that any different than a distributor trigger?

I'm just trying to figure out why it will work with a crank trigger and not a distributor trigger. I'm not arguing that a crank trigger is rock steady and fully understand that a distributor is influenced by cam walk fore and aft in the block and cam twist harmonics.

I have also seen timing units for supercharged motors by P&S (I think) that will alter timing individually on a motor and can use a crank trigger or a distributor trigger (it uses a knock sensor to verify its actions).

J+S is the company. The crank wheel can have 60 marks so cam timing is known every 6 degrees, vs. dist with what 8-10-12-24 marks so the definition and accuracy is not as accurate.