Reasons for Rules

[youngump]

Originally Posted by tcannizzo

OK, here is what got me thinking about this.
Why is a CR prohibited from entering the game as a substitute in the same inning?

I don't know if this is the historical reason, but here's why I'd keep this rule. Suppose you have on your team Michael Johnson. But it turns out he can't hit or field. You have your pitcher get on each inning and then you put Johnson on and he proceeds to steal on the next three pitches and score. All fair enough since the rules let you CR with speed. Then it's bottom seven and you're down two runs. The pitcher gets on and three pitches later Johnson scores. This now makes Johnson ineligible as a sub so he can't replace the next batter to reach and keeps him from being used more than once through the lineup in that inning.