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4/15/2014 11:02 P.M. ET

Towers defends keeping Bradley in Triple-A

PHOENIX -- D-backs general manager Kevin Towers said again on Tuesday that the decision not to promote top prospect Archie Bradley this week had nothing to do with delaying the right-hander's arbitration or free-agent clocks.

With their rotation struggling, the D-backs promoted Mike Bolsinger from Triple-A Reno to pitch in relief Monday and then take Trevor Cahill's spot in the rotation on Saturday.

At the time, Towers said the reason Bradley was not promoted was that the team still felt he had to improve his fastball command. In addition, the team did not want to bring him up at a time when the team was struggling as it is now because that would put too much pressure on Bradley.

"I think it's very apparent what is going on in Arizona," Bradley's agent, Jay Franklin, told FOXSports on Monday night. "Every ballplayer that is playing Minor League Baseball works his tail off to get an opportunity to play in the big leagues. Archie Bradley has proven to the Diamondbacks organization that he has deserved that opportunity by keeping his mouth shut and letting his numbers speak for his chance to pitch in the major leagues."

Towers said the agent's implication that the decision was financially motivated was simply not true.

Bradley pitched well in his first two starts of the spring but then struggled in his final two, and the D-backs decided to start him in Triple-A.

"If he would have continued to throw like he did his first two outings of Spring Training he would have been on our Opening Day roster regardless of the clock," Towers said. "But his two outings, including the one against Team Australia, he did not have the fastball command that we saw earlier in the spring. Struggling even with his secondary pitches to throw them for strikes, and we didn't feel like it was time at that point in time to break with our ballclub."

Gibson trying to move past D-backs' losses

PHOENIX -- If he seems a bit upset when meeting with reporters 10 minutes after a loss, D-backs manager Kirk Gibson asks that you cut him some slack.

"The game is over, you kind of let it out," Gibson said, referring to frustration. "I don't really get a chance to do that. If you guys like to wait 30 minutes or so, I'll be a little more upbeat for you. I've got a lot going through my mind when I talk to you guys."

Gibson was known to be a very intense player, but he generally had more time before he had to meet with the media, and he took even longer before going home to his family.

"As a player I always used to stay at the park very late," he said. "I would never go home until I got rid of it, so to speak."

In his current role, Gibson still tries to get the loss out of his system before going home, which is not always easy given a 4-12 start to the season entering Tuesday.

"My job as a manager is to try and fix it," Gibson said. "That thought process starts, and I need to get rid of them as much as I can so I can get some sleep. And then we get up and we start at it again."

Steve Gilbert is a reporter for MLB.com. Read his blog, Inside the D-backs, and follow him on Twitter @SteveGilbertMLB. This story was not subject to the approval of Major League Baseball or its clubs.