Hrm, my NKJV says in Collosians 1:17 And He is before all things, and in Him all things consist.
It is still speaking of Jesus, here. I don't know what you mean about trinitarians adding 'else' to this verse, but I strongly believe no words should be added to the Bible, no matter what the agenda.
Dontfitin...incidentally, most christians do not believe the Father and the Son are the same person. This would be strange indeed. Rather, the Trinity is 'three persons in one." I do believe Jesus is God, and witnesses ignore or twist the many verses that support this. However I believe the father is given the natural superior respect deserving of a father.
As for the Holy Spirit, I do believe it is a person, there are several scriptures to support this, it is easy to do research online. But as for the Holy Spirit being equal to God, I dont fully agree with that. But I also don't think it's that important. A sin against the Holy Spirit is the only unforgiveable sin, however.