Originally Posted by
briden
You're on the right track, but going around the reasoning. The whole equals thing works as a comparison, but it breaks down with smith, crook, feeble, any of the -cane's. The coincidental opposite effect comes from fakie being regular backwards, and nollie being regular forwards on the nose, but fs and bs don't always switch. The concept of fakie was around way before nollie was, and like hesh said it came from vert terminology.
And why make an exception for fakie crooked grinds?