When the crucified and risen King Jesus walked those fortunate men through the Old Testament Scriptures on the road to Emmaus, showing them how all of it was about him, their hearts burned within them (Luke 24). By God's grace, many of us have had similar experiences when someone has shown us how all of the Old Testament (and all of reality) is about Jesus. Sadly, many fail to see this. In fact, there are a large number of people who think that "Christ" was Jesus' last name. This, of course, is not right.
By using the word "Messiah" in particularly Jewish contexts in the New Testament, the HCSB helps readers see more clearly that Jesus fits into an overarching narrative. Also, "Messiah" is used because the most recent scholarship recognizes the need to translate christos as "Messiah". Below is one example of this from Ephesians 2:12.
HCSB
KJV
NIV
ESV
At that time you were without the Messiah, excluded from the citizenship of Israel, and foreigners to the covenants of the promise, with no hope and without God in the world.
That at that time ye were without Christ, being aliens from the commonwealth of Israel, and strangers from the covenants of promise, having no hope, and without God in the world:
remember that at that time you were separate from Christ, excluded from citizenship in Israel and foreigners to the covenants of the promise, without hope and without God in the world.
remember that you were at that time separated from Christ, alienated from the commonwealth of Israel and strangers to the covenants of promise, having no hope and without God in the world.