The argument you posted (OP) is valid if we're talking just athleticism, I believe. Jordan was an athletic freak, but I think James has him there. Kobe's athleticism was notable as well, at one point, but never on LeBron's level.
But skill-wise, there's no argument...both Kobe and Jordan are/were more skilled than LeBron.
The problem people get caught up in is that LeBron puts up big numbers in other categories, such as rebounding and assists, which makes him seem like he's on top of the food chain in NBA history. It doesn't mean he has a better overall game than those two, though, because LeBron still has openings in his game where he can improve...not number-wise, but skills.
For example, he can give you 30, but he's not a complete scorer. If he doesn't get the lane, he won't put up 30 PPG averages. Kobe, Jordan, even Durant? Different story. Those three can average 30 on jumpers, and get fouled consistently without going to the rim...at least Kobe and MJ (Durant has yet to develop a post game).
Also, defensively, LeBron isn't an elite on-ball defender. Help defense? There's no question he's incredible.
The craziest thing I've heard is that LeBron is better than Jordan and Kobe because he took his team to the Finals without any help. Wold those same people rank Allen Iverson over Kobe and Jordan? Iverson actually won a Finals game "all by himself" back in 2001, while LeBron was swept...so are we supposed to argue that Iverson is a top five player of all time?
In the same boat, people put down LeBron for having one ring. Karl Malone is the greatest PF of all time (sorry, Duncan has actually played center most of his career), and he has zero rings to his name. Charles Barkley is a top three PF of all time, zero rings. Malone and Barkley have zero rings because of Michael, Magic, Bird and Hakeem...the same way LeBron failed to get his for so long because of Kobe, Duncan, and zone defense.
While I just can't stand him, wishing he lost every game for the rest of his career, LeBron will go down as a top 10 player of all time...unfortunately. The only way I'll be happy with that is if he goes back to Cleveland, to win them a championship, and to basically patch up The Decision and all of the attention-whoring and dancing he was doing the last couple of seasons with the Cavs and his first season in Miami.