Nah that's all on him and you most certainly can put it on him.
Every lost he had in Miami 100% him. I'm not saying that Wade or Bosh didn't play bad some series, but THOSE ARE THE PLAYERS HE WANTED TO PLAY WITH. He had help, they just didn't show up. Just like there has been times when LeBron hasn't showed up.
He literally went full out 2K General Manager and traded everybody mid-season and those were the players HE wanted. He wanted younger guys and he got them. And I'll give him credit for dragging those dudes to the Finals but that's the team he wanted. Just like I'll be saying the same shit when he inevitably loses a game or series in LA and everyone starts up the pity party.
Lebron wants Wade and Bosh, LeBron gets Wade and Bosh. LeBron wants Ray Allen, he gets Ray Allen. He wants K-Love and Kyrie, guess who's waiting for him in Cleveland? He wants Wade and company back in Cleveland, it happens. He wants to trade half of the roster mid-season because fuck old people? Go right ahead. Naturally I want the underdog to win and more importantly, I'd love to see the Warriors dethroned no matter who does it, but I'm not giving him a pity party when he's orchestrated and dictated every single roster move since he left Cleveland the first time.