[clamel]

I think a splitter surely debated being a sort of fastball.
In name yes, but else.
Read a lot that this is not any kind of fastball as "normal".

Then I could be wrong, but lots of articles and better known folks don't think this can compare with cutters as a variant to 2-seam and 4-seamers.
Perhaps the forkball should be closer to the splitter (Roger Craig might disagree) than a "standard" fastball.
Some "experts" say the forkball was a precursor to the splitter. I always regarded the splitter as a bit faster type of change-up even.

Hm what about Mike Oquist ? Noted?
I pulled out my copy of Neyer/james Pitcher book and Oquist is listed 1-slider, 2-change, 3-curve, 4-fastball (mid-80).
That info came from The Scouting Report: 1987.

I agree knuckler should even perhaps have a poor fastball, but I understand that the amount of pitches is the most valuable in this game. What types really is only cosmetic, which is a bit sad.

The great fun of pitching.... "What the heck did he throw ???"