"Three years in the rotation, or whatever it was, doesn't guarantee you're going to get the fourth," Wells said. "The two years I had in the rotation didn't guarantee anything. I've been through it before. It was definitely a low point in my career to have to go to Triple-A this year out of Spring Training. I felt I was throwing well.
"It's definitely an eye-opener but it makes you stronger and you realize there's nothing given to you in this game and there's a guy waiting to take your spot every day."
Wells did make two spot starts the first time Dempster went on the disabled list in April. He was recalled May 21, and since then, his longest outing was five innings on May 21 in Houston.
"I don't think I've lost too much stamina," he said.