Here's the real issue:
Ballin's Law of NBA Improvement
"A player shall not play at a level significantly above what they have thus demonstrated in their first four years as a player in the NBA."
Go to basketball-reference.com and check out the stats, and tell me if I'm wrong. Some notes:
1. Those that are high on Rondo Jeff Green had best observe this rule.
2. Ballin's Law applies to FT% as well as everything else.
3. Steve Nash isn't human, so this doesn't apply to him.
Aside from Nash (and, technically, canadians are considered humans), start with JO and Billups. I'll find more if I get bored. It's probably easier to do with free throws, btw.
The fact that you'd have to proactively look for more players just proves that I'm right and the two players you've mentioned are the exceptions rather than the rule.
Haha. So, to summarize, you make a claim about players, challenge people to check it out on basketballreference and claim that the fact that I was quickly able to find examples where you were wrong proves you right. Nice.
BTW, I didn't notice your original claim said that it applied to everything, add Rodman's rebounding to the list, Magic's three point shooting as well. What you have is a trend that most players follow, not a law (or a law with a lot of exceptions).
Anybody that thinks Rondo's jumpshot will improve significantly from this point on is just engaging in extremely wishful thinking.
Maybe, maybe not. The fact is that many if not most players shoot better when they're older.
I really think it's foolish to bank on Rondo ever surpassing his 2009/2010 level of play, all things considered. I'd keep him around for this year and then see what we can get for him when we start rebuilding.
When Rondo was healthy last year he was playing at a level well above that level of play. Those who expect him to regress back to that 2009/2010 level are just engaging in extremely wishful thinking.