Still top 30 in xERA, has 80%+ percentiles in EV, hard hit%, and chase rate. Part of the problem with the Hader's and Iglesias' is that when they get hit, they get bombed. Trevor Richards is another example. He can generate a lot of whiffs, but when he gets hit it's bad news. Bass is like a better Yimi, and like Yimi he's gotten better as the season has gone on.
www.fangraphs.com
Here's how the relievers have looked recently. Yes SSS, but Jays as a team rank 5th in K-BB rate during that span, 3rd in ERA. It absolutely looks unsustainable with the lowest BABIP and 2nd highest LOB%, but the HR rate spiked because of Romo, Beasley, Thornton, and Lawrence which effectively made the team have a 0 fWAR pen during that span. I feel like they addressed their main issues in the pen by getting guys that limit those HRs (Bass and Pop), and also getting GBs and weak contact. If we think Bass will regress, there's also reason to think Pop will improve.