It's all about "throw" - if you understand it our "views" are simple cause and effect.
A refresher:
When the CB's surface rubs across the OB's surface, either from the CB hitting the OB at an angle ("cut-induced" throw) or from CB side spin ("spin-induced" throw), or a combination of the two, it creates rubbing friction that "throws" the OB a little off the CB-OB line-of-centers (more on straighter and slower shots). Throw must be compensated for while aiming, either consciously or "by feel".
"Cut-induced" throw can be easily seen by freezing two OBs together against a rail and shooting that "dead" corner pocket combo straight into either OB from an angle (as if it's the "ghost ball"). You'll see that maximum throw does indeed happen at about a 30° (half ball) cut as shown by Bob's chart above.
pj
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