Erstwhile M’s closer Brandon Morrow, who’s yo-yoed up and down from Tacoma this year, was up last night — way up. Morrow pitched eight innings of one-hit ball in a shutout win versus Oakland, prompting manager Don Wakamatsu to gush like crazy to John Hickey: “”When a guy who has that kind of stuff suddenly puts it all together, you’re looking at someone who could be a top-of-the-rotation guy,” Wakamatsu said. “When you see that, it changes your mind-set looking forward.” We’ve been here been here before with Morrow, notes Hickey, who writes of last night’s start: “It was, simply put, a masterpiece on Morrow’s part. It was tantalizingly similar to Morrow’s first big league start when he took a no-hitter into the eighth inning against the Yankees on Sept. 5, 2008. The year-plus between those starts has been full of trial and error for Morrow, who has bounced from the rotation to the bullpen and back again.”I suppose this forecast would be a whole lot sunnier if outings like last night’s weren’t de rigueur for San Francisco’s Tim Lincecum, the local hero the M’s passed on to select Morrow. But that crucifix aside, what was up with Wakamatsu not letting Morrow finish the game with a seven-run lead, or at least lifting him after a batter in the ninth so he could walk off to a standing O? It certainly didn’t impact the result of the game, but if Wakamatsu can bat Ken Griffey Jr. cleanup all year for sentiment’s sake, what was stopping him from a more theatrical approach to his young hurler?