Those differences are largely a function of other players effects on the game. Bigs need PGs to create for them. Thats not a huge deal its basketball 101. Sacramento's perimiter creators this season were nothing to write home about. Just look a JaVale Mcgee's efficiency numbers in Golden State. Those efficiency numbers are largely a byproduct of others contributions. Boogie also saw an increase in his shooting numbers when he relocated to New Orleans.
Yet despite this Cousins had the 3rd best Assist% in the NBA among players 6'10 or taller according to NBA.com
http://stats.nba.com/players/advanc...6-17&SeasonType=Regular Season&Height=GT 6-10
I'm not particularly enamoured with WS. It was just a simple stat that easily corroborated my point. Win Shares is nowhere near perfect and like most catch all advanced metrics is bias against good players on bad teams, but thats another discussion.
Why is Lebron coasting an arguement in his favor? Dude is ageing and declining. Hes still fantastic but he cant bring it every night. So he doesnt. He still brings it enough that he makes a large impact. Im not saying Lebron sucks. Just that he isnt a top 3 guy.
The Lebron being not a top 3 guy was in comparison to Kawhi, Westbrook and Harden. Although you could probably throw in Durant and Curry. Boogie is closer to a top 10 guy. As for the "playoffs" arguement. Teams make the playoffs, not individuals.
Lebron is less reliant on his teammates then Boogie as a perimiter player, but both still need 4+ other guys to win games.