That's too few at-bats on which to make a solid judgment, in Moore's view.
"After a guy gets a couple hundred at-bats, you start believing the sample," Moore said.
"We're very confident in the Major League players that we have. We've already massaged the bullpen a little bit, and we're encouraged by the performance of some of our Minor League players, but, at the same time, we need to be sure," Moore said.
Among pitchers, left-hander Danny Duffy has been impressive with a 0.90 ERA in four starts, and 24 strikeouts in 20 innings. Fellow starting lefties Everett Teaford (2.65 ERA) and Mike Montgomery (3.00), and lefty reliever Blaine Hardy (1.13) have also looked good. Of those pitchers, only Teaford is on the 40-man roster, and that's another factor -- such a player can be brought up without first clearing roster space.
Righty relievers Greg Holland and Jesse Chavez also have good numbers, and they're already on the 40-man roster, giving them an edge if bullpen help is needed.
Moore has said he expects Moustakas to surface with the Major League club at some point this season.
"We'll see what happens," Moore said. "Mike Aviles has been playing great, Wilson Betemit has been playing great [at third base], so there's got to be opportunity for him, too."
Aviles did well in a Triple-A stay in the second half of last season, putting him ahead developmentally of Hosmer, Robinson and Giavotella, who are in their first Triple-A seasons.