It has been stated a few times on this board that if Jesus were to return, he would be considered an apostate by Botchtower. Would he be a 'true JW'? Highly doubt it.
Interpretation of scripture is always in the best interest of the one doing the interpretation. Always look to the agenda of the interpreter.
As for celebrating, this scripture says you should not be judged by how you wish to celebrate:
Colossians 2:16: Therefore do not let anyone judge you by what you eat or drink, or with regard to a religious festival, a New Moon celebration or a Sabbath day. NIV