Gerrard is all ego.
Basically, he's leaving because Brendan has the cheek to want to manage his playing time so that he has an impact and doesn't burn out and become a passenger during games. Based on this season he's 100% right to do it and every other player Gerrard's age gets the same treatment, it's called good management.
However, Gerrard's ego is so colossal that he refuses to accept that he isn't the integral cog in the liverpool team he once was, it's a physical adaptation which every player who wishes to stay at the top level in this league must make. But not Gerrard! So instead of accepting he's human he's decided he'll leave and play in a championship standard league where his ego can be messaged until retirement and he can be the main man once again.
They formed that ridiculous guard of honour and handed him an actual fecking trophy, yes he got a golden trophy from liverpool comprised of his shirt number (8). It was so amazingly farcical I couldn't believe what I was seeing. I guess they thought he should have some kind of prize in his final season, so they created one.
The worst thing was you could see it in his face, there was no surprise or embarrassment, he expects this kind of treatment and he revels in it. Steven Gerrard the super-ego. It's no wonder he and Brendan have to go their separate ways.