I don't know if Jesus was the Maitreya or not. There are many things about him that fit the description, but I'm sure some would disagree. The Maitreya, at least in Pure Land tradition, was to be a person who completed the Buddha's dharma, and brought in a new dispensation so to speak. The Buddha would then grow to have less and less followers as the Maitreya grew to have more. The Maitreya would also be born in a manner similar to Lord Buddha, that he would be born at night, and also die at night. Jesus was born at night, and if you count the darkness at the time of his death, he died at night. The Buddha also references the Maitreya's teaching in the Dhammapada, where he says: "If you have a treasure, and someone else comes along with a better treasure, sell the treasure which you have and buy that treasure."