I don't really think Buddha = Christ, I think they both achieved the same status...so they were equal in status but still different...Buddha = Christ.
It is a seed in all of us, but not all seeds become trees.
Jesus was reffering to the Christ/Buddha inside us, not to the Jesus inside us, that doesn´t make any sense, Jesus died 2000 years ago.
Jesus doesn´t mention Gautama, but this doesn´t change the fact that they reached a similar level of enlightment, and their teachings were the same. Although currently, Gautama´s teachings are a little less changed than those of Jesus.
In other words, Jesus became Buddha in his time, and Buddha became Christ in is time.
Jesus and Gautama are dead, long ago. But yes, Chris/Buddha is the way, the truth, and the life.
Jesus's teachings are changed because he appeared among the ignorant, the lowest of all people, as Jesus called them the "generation of vipers", where as Buddha, Krishna, and Lao Tzu appeared in relatively good ages, a lot better than the people Jesus appeared to (the generation of vipers)