Even though it was a shortened, very abnormal type of season, there is still plenty of data that probably alarms teams when moving forward with Hader. I complained throughout 2019 that Hader was not using his slider enough, was turning into a one-trick pony and it left him just about zero margin for error. If he misses his spot, his fastball is very hittable when it gets low in the zone. One also wonders how much of a velocity dip he can suffer and still remain effective. In 2018 and 2019, Hader threw his fastball about 82% of the time and his slider about 18% of the time. He was roughly a 2.50 ERA/2.65 FIP/2.20 xFIP pitcher over those two seasons. Hader was not as good in 2019 as he was in 2018. The ERA/FIP/xFIP were all higher in 2019. ERA and xFIP was fairly close, but the increase in home runs allowed caused the FIP to jump significantly, from 2.23 to 3.10. The home run factor played significantly into his fastball effectiveness, as his fastball pitch value went from an incredible 19.1 in 2018 to a still excellent 13.6 in 2019. But things changed in 2020. Probably seeing the drop in fastball effectiveness, Hader threw the slider significantly more. Instead of being 80+% with the fastball, the mix changed to 68% fastball/32% slider. The fastball effectiveness also took a major drop, all the way from 13.6 in 2019 down to a very average 0.2 in 2020. And while Hader was still a quality pitcher in 2020, he was nowhere near as good as he was the previous two seasons. 3.79 ERA/4.03 FIP/4.01 xFIP. I'm guessing teams probably look at FIP and xFIP more than anything then projecting a pitchers future performance. Hader's FIP has gone from 2.23 to 3.10 to 4.03 over the last three seasons. The xFIP has gone from 2.05 to 2.36 to 4.01. The FIP is very concerning because it's been nearly a full run increase per season. It might be a pretty huge stretch to think that the majority of MLB teams see Hader as a super-elite type of reliever at this point. Just looking at Chapman, he's only had a seasonal FIP over 3 one time in his MLB career (3.29 back in 2011). At his prime he had a five year run with FIP's under 2 in 4 of the 5 seasons (it was 2.47 in the one season he missed). The first time Jansen had a FIP over 4 was in his age 30 season. Prior to that he had 7.5 MLB seasons and his worst FIP prior to his age 30 season was 2.40. Kimbrel has a run where he was just at a completely different level. Just looking at this era's top relief pitchers and FIP through their age 26 season- Kimbrel = 1.52 Chapman = 1.97 Jansen = 2.00 Hader = 2.84 So Hader is a step behind and from 2018 to 2019 to 2020 he is clearly trending in the wrong direction.