Powell Machine had some storm damage but let's talk cams anyway.

ALL of the events have some importance, some more so than others. I do not agree with Powell's selection of the most important event.
That would only be determined by dyno testing, not some computer program, because there is no computer made that can guess what all the variables that are happening in the the engine are doing/will do.
Piston speed [ PS ] is very important. It is needed to create vacuum to pull air into the cyls; air makes the hp. At TDC & BDC, PS is zero. Somewhere between TDC & BDC, is the maximum PS.
I believe that D. Vizard's dyno testing of 19,000+ cams found the sweet spot. And it is NOT IVC. It is the relationship between valve at or near max open....& piston speed. And valve max open corresponds to the LSA....

One cam was too big, one too small? That is what the 128 rule was supposed to fix; you buy one cam...& it is the correct cam.