Galaxies do not merge,and instead, galaxies are spreading out from one another, which is called cosmic expansion and is basic observational fact. Now, isn't it true that you are deliberately resisting the expansion of the universe by coming up with a theory of galaxy's merger? The theory of galaxy amalgamation should be completely abandoned, and no one has really seen merger so far. Now, Yang's theory of galaxy formation is the most scientific, completely consistent with the fact that the universe is expanding.