46 year old - 1400+ free throws in an hour. Do you think Rondo is practicing as much as this guy or maybe not? Do you think all the thousands of NBA players practiced as much as this guy? What do you think would happen if they did? By the way...he only hit 85%. So maybe raising it to 90% is unlikely. But I'd settle for 85%
Do you really think posting these videos somehow bolsters your claim? First of all, none of them do anything to prove your claim that *everyone* can get to 85% or so with their ft shooting if they practice enough. You can't show that everyone can shoot at that rate with practice, so you can't show that Rondo can get to that level with practice, just like you can't show that the 95% or so of the players in the nba could get to that level if they practiced more.
I don't even see any real point in your finding a 46 year old who (in your opinion) practices shooting free throws more than most nba players. It's probably the only basketball skill he practices significantly. This will probably come as a surprise to you but there are other aspects to playing in the nba than just free throw shooting that require practice as well. So, does Rondo (and other players) practice shooting free throws more than every single person on the planet? No, probably not. Does that mean they don't practice at all, they're lazy or they don't care? Of course not.