Ian Stewart’s on-again, off-again spring is off again – and it probably means the third baseman’s off the Opening Day roster. “I don’t know if he’s got enough time,” manager Dale Sveum said Sunday as Stewart took a third day off because of continued quad soreness and was scheduled for another MRI on the injured area Monday. “It’ll be interesting.” Stewart strained the quad running out a double in his first at-bats of the spring, in the Cubs’ Feb. 21 intrasquad game, and didn’t play again until batting five times as a DH in a minor-league game Thursday. He’s been sidelined since. The Cubs can save $1.5 million of Stewart’s $2 million contract if he’s cut before the April 1 opener, but he’ll more likely open on the disabled list and get an extended shot at returning to the field.