This being the case, I think Lewis is _not_ avoiding saying that the Being composed of three persons can also be legitimately spoken of in the personal singular, i.e. as a single person.
Yes, of course Jason is right. But then,if God is a person composed of three people, doesn't that make FOUR people?
Or is God just those three people, and not, in himself, ANOTHER person?
I think Lewis has got himself in trouble by thinking of God as something COMPOSED OF three people. Presumably Anselm and Co. would say that God isn't composed of ANYTHING - not even the Father, Son, and Holy Ghost.
VR: Saying the Godhead is composed of anything is, I think a heresy. I'll have to look at the relevant passage to see if it is meant in a way as to make a heretical reading plausible.