The catch here is that they might lose too much of their supporting cast to make the team as dangerous as it once was if they get LeBron. Capela, Ariza, Tucker, Green, etc were a huge part of what made them who they was. If they lose Capela + one of those guys they might not have enough to be the clear cut better team between themselves and GS even with LeBron
The idea is if you add LeBron to these current Rockets thats a chip. If you add LeBron to a depleted Rockets that might be only slightly better than what you have now