He had a swinging strike rate of 19% last year and 17% the year before in 85 innings. He's a guy that can give you more than one inning. I'm not sure how pitching in Oakland would have much of an effect on the amount of swings and misses he get. Chapman gets paid 18 mil a year in New York and he's never pitched more than 57 innings in a year for them.
I don't know what sort of argument you could make to say he hasn't been a top 5 reliever in the game over the past 2 years.
i'm fine with you saying you don't want to pay a 32 year old reliever that much money over that amount of years. Guys can fall off the rails at any time. Chicago who already got a one year rental in Lynn probably probably feel pretty good about Hendriks as their highest leverage reliever next year. How will they feel about that in year 2, 3 or 4? Time will tell.
I would have liked Hendriks, but given the needs of our team I wouldn't have went to those levels either. We need to get out there and overpay for a Springer, DJ Lemahieu, JT Realmuto or a starting pitcher.