I totally agree! Chris=sperm donor. He has never been there in a crisis for his daughter, has never shown anything other than to use Rory to get to Lorelai. I am not a big fan of his, probably because he reminds me of my ex-husband...LOL. I do think because he paid and because Rory wants him there he should be at the graduation, but Luke is the one who earned his invite by "actions speaking louder than words"