"For now, that's what our plan is," Gibson said. "As it stands, we'll have six starters. Things could change but we've sat and talked and made a decision as on organization."
Skaggs, a 21-year-old lefty, tossed 6 2/3 innings Wednesday, allowing just two runs on three hits in a 3-2 win over the Marlins.
"I'm just happy to be here, honestly. I'm comfortable with whatever they want me to do," Skaggs said. "It's been great, unbelievable, nothing to complain about. I've just been trying to soak it in."
The rest of the rotation -- consisting of Patrick Corbin, Ian Kennedy, Trevor Cahill, Joe Saunders and Wade Miley -- will remain intact with Skaggs being added to the back end.
One of the reasons Gibson listed for making the move was to give his arms more rest during the team's current stretch of 23 games in 23 days. Another reason was to get Skaggs more experience in the big leagues after he dominated in the Minors.
"It can be very beneficial," Gibson said. "We've talked about that with everybody. The time you get up here is beneficial. You can monitor everything."
With the addition of Skaggs, the D-backs' rotation now consists of four lefties and two righties, something of an abnormality for most teams.
"It's unusual, I will say that, but we're trying to win ballgames. I think we believe that certain people deserve a chance to continue on their development and help us win ballgames," Gibson said. "We'll try to mesh it all together. The lefties have done a good job of pitching to righties so far."
Once the D-backs get into mid-September, they'll have four off-days over a two-week stretch, making a six-man rotation less applicable. But whatever the club decides to do moving forward, the starters will need to find different ways to work with more time off in between outings.
"There are a lot of options, you might throw a longer bullpen, a shorter bullpen, or on flat ground. There are different ways to go about it and stay fresh," Saunders said. "Just do what feels right. If they think that's what is best, I'm all for it."