1. Satoshi vanished just about the same time Hal Finney was diagnosed with the terminal disease ALS. There is no any other good reason that Satoshi retired from the project at that particular time.
Don't just work by some of your fake theories in confusing the public about the real state of things here, Satoshi is not Hal Finney, maybe you have forgotten that the same Satoshi made the first ever bitcoin transaction to Hal Finney in testing on how bitcoin transaction could be, secondly they both left the forum doesn't mean they are one single entity, each has his own separate account on Bitcointalk and you can't confirm your claim by any of them signing a message, so if this can't be established, then disregard any assumptions that may cause confusion for you, Satoshi is not Hal Finney.