Ryan Divish of The Seattle Times reported that Carlos Vargas hit a setback while ramping up his throwing program, which means he now has to start the whole progression over again. That is the kind of injury note that can look pretty harmless in isolation. Then you remember the Mariners’ bullpen is already trying to find enough clean middle innings, and suddenly it feels a lot less minor. Vargas has been out with a right lat strain and is technically eligible to return from the 60-day injured list on May 23. But after this reset, that date feels more like something on paper than something Seattle should be counting on. The Mariners don’t need Vargas to come back and save the bullpen. But the setback still stings. Seattle’s bullpen issue right now is about finding enough stable innings to actually get there without the middle innings turning into a group project with a fire alarm going off.  Vargas was not perfect in 2025, but he was useful in a way teams usually appreciate more once it disappears.…