I don't think Lebron, Wade, Cousins, Westbrook or Paul belong on that list.
I might add Love, though.
I do feel Lebron belongs on the list, but I guess it depends on your definition of the term 'Toxic'.
If by "Toxic" you mean guys who are so destructive in a locker room that they make their teams bad as a result, then I think Lebron's success (in terms of wins) pretty clearly disputes that.
If by "toxic" you mean his presence degrades those around him, then I do agree with this. I think Lebron is an incredibly arrogant and egotistical person - he might not show it to the full extent in the public eye, but I get a sense that he's much more arrogant and egotistical behind closed doors, and that he's very difficult to be on a team with. He seems extremely self centred, and seems to expect every team he plays on to be 100% built the way he wants, and centred 100% around his game.
I feel everywhere Lebron goes, everybody who plays with him has to sacrifice everything, and completely re-mould themselves into being somebody else, just to survive alongside him...and yet I never seem to see Lebron ever make sacrifices in his game in order to try and fit better with others.
I feel like he makes everybody around him worse everywhere he goes, and but manages to win anyway on his rediculous talent alone. I kinda put him on MJ's level in that regard - arrogant, egotistical **** who gets excused for it simply because he is talented enough to be able to win anyway. In this league, winning really does excuse you of all faults.
Wade I do not believe belongs on this team. I see Wade as a very KG like guy, in that he is an ultimate competitor who will do whatever it takes to win. He plays with heart every night, he gives it his 100% whenever he's on the court, and he backs down from nobody. There is no denying that Wade is a dirty player, but you can make that argument for KG too. The difference between Wade/KG and other dirty players (like JR Smith and Ron Artest) is that Wade and KG are the type of guys who will make cheap plays in order to give them an edge on their opponent...whereas Smith and Artest seem to make cheap, dirty plays simply because they are utter head cases who have no control over their own frustrations.
CP3 I put in the same category as Wade and KG. He can be cheap / dirty in the way he plays, but ultimately it's all in the name of competitiveness. I can't help but feel that CP3's teams are always way better with him than without him, and I think he also makes individual players around him better as well. But he's highly competitive and will do what it takes to win.
Cousins I don't see as toxic either. Cousins is a very emotional and competitive player. I honestly believe he plays with huge passion and energy every night - some people argue he takes plays off. I argue that it's hard not to when you have to constantly to EVERYTHING for your team. Regardless, he's a guy who wears his emotions on his sleeve, and while that passion is what no doubt drives him to be as great as he is, sometimes it gets him in trouble. I think being the best centre in the NBA (as a result of that passion) greatly outweighs the occasional outburst or vent.
I don't think Cousins he's toxic though, because I haven't really seen evidence to suggest Cousins creates problems with team-mates, with owners, with management, etc. He's stuck by one of the mist toxic franchises in the league, even though they continue to struggle to put a winning team on the floor, and constantly make stupid decisions. Even with the whole George Karl fiasco, Cousins seems to have avoided overreacting and accepted the situation with a surprising amount of grace. Plus he's managed to co-exist with Rajon Rondo without any noteworthy dramas, and that is high praise in itself. I think Cousins would be a much calmer guy if he were playing for a more respectable and stable franchise - I think any passionate player (Wade, Paul, Garnett, Kobe, Pierce, etc) would get extremely frustrated and start losing it if they spent their entire career with the Kings.
Westbrook, I don't know. I don't feel he's toxic, I just feel he's kinda a weirdo and introvert. There have been some signs (such as the aforementioned comments about Smart) that suggest he's a bit of an arrogant princess who is used to having everything go his way (can't take getting outplayed, so has to put dirt on the other guy) but even if that's true it doesn't make him Toxic. I'm not sure he has any negative affects on his teammates, after all.