The power behind the church's mission

This one's for my more religious-type friends.

One of the joys (and frustrations) of worshipping in a church tradition different from your own is that the hymns are hardly ever quite the same. Today at Christ Episcopal Church we sang Rusty Edwards', "We All Are One in Mission." I've sung it dozens of times in Presbyterian settings, but this was the first time I sang this stanza:

We all behold one vision,
A stark reality:
The steward of salvation
Was nailed upon a tree.
Yet resurrected Justice
Gives rise that we may share
Free reconciliation
And hope amid despair.

It is in the original hymn, according to the web, nestled between our usual Presbyterian second and third stanzas. Seems to offer theological justification for being "one in mission." I wonder why we Presbyterians omit it? Not enough room on the page? Theological considerations? Other reasons? I invite your comments.

(BTW, today's homilist quoted Karl Barth, with approval!)