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‎1.He is suffering from a severe disease, so as not to even able to walk on his own.

2.He is suffering ftom a severe disease, so that he can't even walk on his own.

Q1. Do both sentences mean the same thing and are both all sound natural?

Q2. Must there be a comma before "so" ?

Q3. I think in this case, "so as to" describes the degree of how much he is suffering, like "so that", and for this reason, I don't think "so as to" means "in order to" in sentence 1. Am I right?

Comments  

Before answering my question, please have a look at the edited sentence.

(EDITED ‎1.He is suffering from a severe disease, so as not to even able to walk on his own. >>>> ‎1.He is suffering from a severe disease, so as to not even be able to walk on his own.)