I like some "illustrations" about the trinity like the time and it's three forms: past, present and future.
All of them are distinct but all of them are time.
You cannot talk about past, present or future without talk about time.
Also you cannot talk about holy spirit, jesus and the father without talk about dog, ops, god.
The main issue about jesus saying the father was greater it's a fail, 'cause the jesus was a diminished form of the trinity son. Jesus it's like an avatar of the son while on earth so he could talk about the father being greater than him.