Oh no don't worry I'm glad you took time to break it down, it all makes sense to me but you added a bit more to it. I can picture celestial objects closer to the core of their galaxies will move faster and mash into each other more often and influence orbits of each other and whatever was first a disc might turn more into an orb, especially in the middle, like you said with the galactic bulge.

Eh no worries, English isn't my native language, astrophysician was the closest I could get, I should have listened to the spellchecker lol. ^_^