What do you think these other things could be?
I generally assume he was moving on to battle an illness, and that he lost the battle and died.
exactly what happened to Hal.
.....
Probably this. He was dealing with ALS, and he died. He was probably Hal Finney.
There are many discussion regarding this, Finney had an account here and he used to communicate with Satoshi and help him with the codes during the initial stage.
Yes, Hal Finney, a very smart guy who could make us believe that he was not satoshi, for me this is the very probably.