Substitution=Mass confusion

[the splinter]

I am in an all injury league(nobody with 600 PA's)...

Game 2 Rocco Baldelli goes down for 8 games on a HBP.

I have Taveras as a substitute CF both ways.

Since Rocco needs a PR I would assume that Taveras is the choice.

Hal subs in Lane...a slower runner and a weaker CF'er

Please explain.....?