I've just thought about this
Ok, so what if Lance didn’t want to go in Garrison?
Like he and his grandpa made a promise when he was just a kid before his abuelo died
So, he goes to garrison and meets Hunk and then Pidge and when he sees them he thinks ‘woah, they’re amazing guys, LET’S PROTECT THEM ALL COAST’ so he puts a lot of effort to being a good friend and pilot and he becomes a fighter pilot (in that he was still in the cargo class) and he feels very proud but , as we know, when he make littles mistakes they always go with “you’re just in the fighter class ‘cuz the best pilot of our generation droped out” and that makes him feel as the worst and start to miss his family MORE ‘cuz “If they say that, then its better to go back home”. Hunk and Pidge always notice that and they try to make Lance feel better (in the night they listen Lance crying and being homesick). Thanks to this, Lance starts to love being a pilot and thanks his abuelo for making with him that promise and still he misses his family but starts to feels comfortable because he feels that Pidge and Hunk are like his family but in garrison.
bUT then happens the voltron thing and the sadness :-) and :-) homesickness :-) strikes :-) again :-).
He tells to Blue every night about his family and his friends in Cuba, his story about how he ended in the garrison and he “secret” (it isn’t, the mice and hunk already know about that) crush on Keith.
Blue always feels happy of having a paladin like Lance who fits perfectly in the role of the blue paladin. But also feels sad because “i dont want you to be sad :‘c you look really good happy :)”
Anyways, the team starts to hang more with eachother except the fact that nobodys ;)))) knows about :)))the depressed Lance :)))
And they start to make him unwanted, not-the team sharpshooter the cargo pilot the comic-relief the paladin that can be replaced easily, in conclusion THE SEVENTH WHEEL.
They fight against Zarkon and Shiro dissapears, they feel worried and sad, Keith becames the black paladin and Lance the red one, and then comes.. Lotor.
So he captures him and uses his weaknesses and breaks points to torture him.
The team (now with Shiro) rescues him, puts him in a pod and waits until he heal.
But, when Lance comes out, the team starts to argue to him, saying that he needs to hear the others and not to be mocking around, and Keith tells him “YOU’RE JUST A CARGO PILOT!” And “ITS ALWAYS YOUR FAULT” aaaaand Lance explodes.
So he tells everything, about the promise, about his crush on Keith, about the seventh wheel and finishes with “I’VE NEVER WANTED TO BE A PILOT I DIDN’T ASK FOR BEING A PALADIN”
All the team shuts in silent, Pidge starts to sob, Hunk is horrified and asks himself “is this the Lance i know?”, Shiro feels guilty for not listening Lance, Allura feels like the worst because she treated Lance like he was nothing, Keith feels super super super confused, angry, sad and happy in the same time and Coran…well, Coran already knew about Lance insecurities and feels bad for not telling the team about the selfless Lance
The Lions are angry (Lance treated them good and he puts to them cool pet-names. Also they heard a lot of Lances confession to Blue and when they heard him sing [yes, Lance can sing] they feel relaxed ) and refused to open to their Paladins.
Reds tells them that they need to fix this but first they need to convince Blue, who is extremaly angry with the team.
Shiro says that maybe Lance needed time to himself and that they will talk to him later.
They didn’t notice that Lance left the castle until dinner time.
They notice that Voltron is not gonna to be Voltron anymore.