Originally Posted by
BeanieAntics
Using the top 5% of players to point to some sort of trend probably isn't the best way to evaluate the aging curve for players in general. Its also true that a pitcher's velocity starts on a steady decline VERY early on in their career. There are some unicorns out there who either buck that trend or figure out ways to mitigate their physical decline, but those guys are exceedingly rare. Madison Bumgarner isn't one of those unicorns. Madison Bumgarner isn't even close to the top 5% in the league anymore. The fact of the matter is that he hasn't had an xwOBA under .300 since 2016, its trending in the wrong way, and his statistics have reflected it over a longer period of time than just his past 6 starts.
He isn't in his prime and he is obviously declining. That doesn't mean he is useless to us, but it does mean that we shouldn't value him as a "HoF pitcher in his prime" when talking about trade scenarios. It also means that, under no circumstance, should we offer him a deal that carries him through his age 35 season. That would be insanity of the highest order.