Or it'll show yours. "His" and "Their" could be used to explain the colloquialism of hearding/schooling life - i.e. fish are generally schooling, cattle are generally hearding, etc. Or, it could even just be an interchangeable reference used by those who translated the bible at the time, not knowing how someone four centuries later would horrendously misinterpret it to mean something it doesn't. No matter whether either of these, or any other explanation is used, what isn't used is your nonsense term of "his kind" and "their kind" referring to God/Jesus/Holy Spirit since firstly, the Jews who wrote and kept the old testament only recognise God as the sole creator of the Universe, and the Holy Spirit to be the euphoric motivation one feels/personifies in the pursuit of divine enlightenment (i.e. not part of a trinity per-se). The next blatantly obvious point is how the Old Testament Hebrew speaks of these creatures reproducing after his, her and their kinds to mean kinds of life, not of God/Trinity kind:
http://www.scripture4all.org/OnlineInterlinear/OTpdf/gen1.pdf
So, there's a few more plausible explanations than yours - You on the other hand have to justify how you know of this mortal/immortal title (which still hasn't been properly explained btw) that you arbitrarially assign to these words without justification. What biblical reference do you have for any of this given every other translation of the Bible, and biblical study speaks of creature kinds, not God/Trinity kinds?