Can/Does man see one member of the Godhead simultaeoisly or at the same time?

Sure, in cases like John the baptist at Christ's baptism or with Joseph Smith in the Sacred Grove...  Or in verse 1 Nephi 11:27 where Nephi sees Christ and the Holy Ghost (with the Father recognizing the Son--which is exactly like John the Baptist...).  But what about 1 Nephi 11:12 (where the Holy Ghost had gone before Nephi's presence when the Virgin was with child...) or how the disciples aren't given the Holy Ghost till after Christ is no longer with them!  --  in the economy of God, I just don't think that man needs more than one member of the Godhead there at once (redundant?)!  Just as scriptures are not re-translated if it's possible to get your hands on the already-existing copy!

JPS