"He's just not throwing the ball well," Gibson said. "He's very mechanical, he's thinking a lot. He just didn't throw the ball well so I had to get him out of there. He's got a lot on his mind so we've got to try and free his mind up. We try to be positive with him. I know he's being really hard on himself and I know he was trying to correct some stuff out there today.
"You live and you learn. I think he probably feels pretty bad about what's going on right now. I told him when I went out there that this is as bad as it gets, you'll be fine. You'll live and learn. You've got to go through it, nobody enjoys it, but it will make him a better pitcher and probably a better person."
• Wade Miley, who was scratched from his last start with tightness in his bicep, will throw in either a "B" game or a Minor League game rather than a Cactus League game Monday.
• Shortstop Didi Gregorius will start over in Minor League games in six of the next seven days as the D-backs try to get him more at-bats. Gregorius has not been able to play in the field due to an elbow issue. He will likely make his debut in the field in another week or 10 days.
Gibson said Gregorius is on target to be ready to start when the Minor Leagues open the second week in April
Steve Gilbert is a reporter for MLB.com. Follow him on Twitter @SteveGilbertMLB. This story was not subject to the approval of Major League Baseball or its clubs.