The Mariners traded left-hander José Suarez to the Athletics for cash on May 14, ending a stay in Seattle that barely had time to become a stay at all. The Mariners had designated Suarez for assignment earlier in the week to clear space for Bryce Miller’s return from the injured list, which pretty much tells the story by itself. Suarez got one appearance, gave them two innings, allowed a run, and was gone before the fit ever had time to become a real conversation. That isn’t a big organizational loss. Suarez owns a 6.38 ERA in 18 1/3 innings this season between Atlanta and Seattle, and his profile comes with enough red flags to make the quick exit easy to understand. But the timing matters. The Mariners moved on because the pitching staff is starting to run out of extra chairs. He has missed more bats than usual, with a 26.7 percent strikeout rate and a 13 percent swinging-strike rate, both comfortably above his career norms. It’s why pitchers like Suarez keep getting chances.…