Teams obviously look more at those numbers than they do things like ERA, wins or saves, but they look at a lot more than that. They also don't read too much into 19 innings. Thing with Hader is that he had that 5 walk game against the Pirates, that accounted for half his walks and a quarter of runs given up. It's not as if he generally started giving up more walks; he didn't walk a single batter in the 11 games he had after that Pirates game. So whatever was up with him that one game is something that has not been an issue at any other point in his career. Batters were .123/.269/.292 against him even with that game included. His Statcast page looks like this. Point is, don't read too much into FIP in 19 innings. So yeah, I think he's still viewed as an elite reliever by most of the league. More importantly than that though, is that he's probably the best *available* reliever, which is the key. A team might want Chapman or Hendriks more, but they can't have them. So if you're going all in for the next couple of years like SD, and the bullpen is the worst (Still pretty good, but not elite) area of your team, Hader makes a ton of sense. All that being said, he won't get anywhere near the kind of return most people think, simply because relievers just aren't that valuable. Chapman was an overpay, and rental relievers haven't gotten that kind of return since, and it's 5 years ago now.