To go back to Donaldson for a moment. I think 4/$92M is actually a pretty good deal for him. I'm just a dumb message board person, but I would have been perfectly happy with him coming to to the Braves for that.
1) His bWAR last year was 6.1. At ~$8m/WAR, which is about what fangraphs seems to be using for 2019, that means he was worth ~$50m last year alone. His fWAR was 4.9 which would be ~$40m.
2) His projection for 2020 on FG is for 5.3 WAR, or ~$42m (plus inflation!). Even with a steep aging curve after that (say losing 50% value per year), it would be hard to be overpaying (in the projection) by all that much over the course of the contract.
3) I think we tend to underrate just how good JD has been. He has been playing like Hall of Fame caliber[SUP]TM[/SUP] 3B. Look at the HOF leaderboards and sort by WAR7 (
link). The median HOF WAR7 is 43. Donaldson is already above that at 43.8, despite only having 6 full seasons. Essentially, that means over the past 7 years, he has produced the peak of the average HOF third baseman, even though the 7th season being counted is only partial. That's just bonkers good.
Here are the other modern 3B who have passed 43 WAR7 and how they performed from 34-37:
Edgar Martinez (lol, "3B"):
WAR7: 43.7
Age 33 WAR: 6.5
WAR 34-37: 22.4
Value: $179M
Scott Rolen:
WAR7: 43.7
Age 33 WAR: 3.4
WAR 34-37: 11.4
Value: $91.2M
Chipper:
WAR7: 46.8
Age 33 WAR: 4.1
WAR 34-37: 20.8
Value: $166M
Adrian Beltre:
WAR7: 49.3
Age 33 WAR: 7.2
WAR 34-37: 24.7
Value: $198M
MEDIAN:
Age 33 WAR: 5.3
WAR 34-37: 19.8
Value: $158M
There is always the chance of injury or whatever, yadda yadda, etc, but even if he's "only" as good as Rolen, that contract will be fine.