chicagoskycam
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I believe Chuck did what he did because he couldn't practice law any longer. I think they showed that the law was what drove him even with his imaginary/made up disease. I think you can see the finality on his face as he is walking down the stairs during the standing ovation. The firm was his life's work and he really believed he could get position back by doing that lawsuit thing. Howard rightfully called his bluff. It didn't take Chuck long to deteriorate after Howard gave him the goodbye check.
I don't think Jimmy led Chuck to immolation.
That and his condition, it was obvious it was worse with stress. It probably started when his wife left him.