The argument is not dumb. His Sabbath is a shadow, a rehearsal for His eternal Sabbath and the renewal, the healing of life for His people.
Without His Sabbath, there can be no renewal, without His Sabbath there can be no healing! Take away His Day and there is no need for Him now is there?
Yeah well, when Christ comes to rule on the Earth what ever Sabbath day he declares it to be...then that’s what it will be for everyone. Christ was know to do surprising things when he was on the Earth. Maybe he will make the Sabbath on a Thursday...just to mess with our preconceptions .
Indeed, where-ever He is, so is the Father, so is the Holy Spirit and in the presence of God shall be our Sabbath feast, joy, peace, and rest, forever!