Ben Wallace was a career 0.474 FG% shooter. If you never actually watched him play, you would assume he was good shooter. Truth is, he was one of the worst shooters in the history of the NBA. The stat is meaningless.
Sure if you excise all information about his position, positional averages, and from where he took his shots.
Rondo is making a ton of his midrange jump shots. Now shooting percentage of all players is pretty darn noisy, especially jump shooting. He could just be on a 28 game hot streak that will average out.
But to say taking 3 such shots a game, and making over half of them is meaningless is strange. How is he supposed to show he's a "good shooter" other than taking and making those shots?
Unless you define a good shooter as also encompasing the ability to hit 3s or hit shots coming off screens. Rondo doesn't do those things, but neither does KG.