PITTSBURGH -- Madison Bumgarner needed four rehab starts last season before a return to the big leagues. The Giants have already discussed cutting that way back this time, with him possibly needing just one or two.Manager Bruce Bochy said Bumgarner's flat-ground work has been so impressive that he won't need as much minor league time as a year ago. But there's something else at play here, something left unsaid. Watch All Video From the California Governor's Debate The standard for the rotation right now is not very high. The Giants haven't had a starter complete six innings since last Saturday, and too many starts are ending after the fourth. Couldn't Bumgarner do that as he works to build arm strength? Yes, yes he could, and those innings would likely be crisper than the ones Bochy is getting now.Bumgarner will throw a bullpen session Monday in San Francisco. He will face hitters when the Giants are in Houston the next week. He is eligible to return on May 26, and Bochy said he won't need much more time than that. Oakland Kids Stranded in Fla. After Mom's Death Return Home "It's going to be close," he said. "That's how well he's throwing the ball. If his pitch count is around 75...