I'm so sorry. I've been following this thread and hoping that it would have a happy outcome, but it was not to be. At least you gave him and his brothers and sisters a chance, and some love and comfort in their short lives.
I'm so sorry that Lucky has passed. As with all the kittens, he was in for a fight right from the beginning. I want to thank you for opening your heart to these little ones. I know it has been very tiring and upsetting for you but please know that they knew love, warmth and caring in their short time with you and you should be proud of that.