The idea of trading Castle is also a fun, important discussion (as much as folks might want to view Castle as untouchable... I'll still contend that only Wemby is truly untouchable).
Ideally, in trades you'd always find a way to send out your assets at their peak value. And the fact of the matter is that there is probably around an
85% chance that this is Castle's peak value. There is a decent chance (probably 50% of the outcomes) where Castle just goes on a development path where he stays what he is now, or gets worse. Any of those outcomes will result in his trade value diminishing over time because of 1) his age 2) his contract and 3) expectations of him developing into more are currently baked into his value.
I'd say there's about a 35% chance that he continues to develop on a path in line with what most reasonable folks would expect from a typical ROTY winner (by typical I mean not "generational" like Wemby, Luka, LeBron, etc). This 35% of outcomes is already baked into his trade value right now.
And there is probably about a 15% he exceeds those expectations and develops into an All-NBA type (which I don't think is the reasonable expectation of his future right now).
Translated, if you traded Castle now and got a "fair" return for him, there's probably about a 15% chance you end up looking really stupid and an 85% chance you're viewed neutrally or better.
Granted, on this next statement, the objective isn't always to merely sell off all your players and I don't want this to be viewed that way. You hope you draft players who are worth more on the court for you than their trade value and you just play them and win games. But... strictly viewing things from the lens of how the Spurs have taken advantage of maximizing the trade value of young assets:
- Dejounte Murray - Absolutely traded at his peak value. A++++
- Derrick White - Probably traded for fair value at the time but he developed into much more, so in highsight looks like kind of a bad trade except for the fact that it was part of the tear down that led to Wemby, so "no ragrets"
- Jakob Poeltl - I'd say also traded pretty close to his peak value. Maybe a summer early you could have gotten more, maybe not? Either way, job very well done
- Keldon Johnson - Obviously hasn't been traded, but we definitely missed the boat on his peak trade value.
- Devin Vassell - A little harder to say, but I'd say we've most likely missed the boat on his peak trade value as well, if for no other reason than you'll get more for a guy still on his rookie deal versus when his extension has kicked in unless they are on true bargain extensions like Herb, TMIII, DJM and Derrick when we traded them, etc.
- Jeremy Sochan - Looks like his peak trade value is also quickly fading into the rear view. If he signs what is perceived by the league to be an overpay on his extension, things will diminish further
If you're not going to trade the guy... timing his peak trade value is irrelevant. But if you do eventually trade them, you want to time it the way we did Dejounte and Derrick and NOT like if we were to trade any of the Power of Friendship now.
TL;DR version: Castle is
most likely at his peak trade value now. If the Spurs for some reason don't see him as truly part of a "big 3" or even "big 2" going forward... then it is probably in their best interest to maximize their return now, as much as fans would hate it (they'd probably think we were as bad as Nico Harrison, tbh, but they'd probably end up proven wrong)