You mean when he stops pitching like "I am Sam". It's all mental with Pelf because physically he has the tools to be a very good pitcher. I believe he'll end up being one of those throw in guys in a trade in July.
How many above average MLB pitches does Pelfrey have?
Knowing the overall *shape* of an idea, argument, situation requires as many facts, models, opinions as you can take/make to see a whole.