With an off-day Thursday, Gibson has the opportunity to skip a starter, give each starter an extra day of rest or even reorder his rotation.
As it lines up right now, the D-backs have two righties at the top in Ian Kennedy and Trevor Cahill, followed by three young left-handers in Tyler Skaggs, Wade Miley and Patrick Corbin.
"I'm very curious about whether we should split the righties up and split the lefties up more than the one spot there," Gibson said. "But with the lefties together it's worked OK. They've thrown pretty good."
Having three lefties in a rotation these days is a bit unusual and there is no way to prevent at least one instance each time through where there will be back-to-back southpaws.
"You can look at the numbers part of it and many teams and players have great numbers against lefties," Gibson said. "Our lefties hold their own. They do pretty well against righties."
Corbin, Kennedy and Cahill will start in the Giants series starting Monday and, if Gibson elects to stay in rotation, then Skaggs, Miley and Corbin would face the Padres in San Diego.