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I think the fact that Kelley was going 2-3 innings at a time in Spring Training led everyone to believe he was going to be a guy who would come in and give you 3 IP each couple of days (meaning 2 IP one day, 1 IP the next... or 3 IP one day, then day off). I really think Wak just wants to get everyone in there based on his comments the other day about getting White "some work because he hasn't pitched in awhile". I think Wak wanted to get Lowe in there last night, so he had to pitch him in the 8th thus limiting Kelley to one inning.
I haven't been pleased with the bullpen management through two games, but I think you are right in that Wak wants to get everyone in there early on and see how these guys respond to different situations.