Christ did not
Reveal everything, so He could not be the only way:
Only the Spirit of Truth (The
Seventh Angel) will eventually Reveal the whole Truth:
12 I have yet
many things to say unto you, but ye cannot bear them now.
13 How be it when he, the Spirit of truth, is come, he will
guide you into all truth: for he shall not speak of himself; but
whatsoever he shall hear, that shall he speak: and he will shew
you things to come.