I love how determined both Lance and Keith are to do something that validates who they are as a person.
Like here, not even once did Lance take his eyes off of the target that he was aiming at, he wanted to prove his worth as the Sharpshooter and not the seventh wheel and he really did.
Then here when Keith was fighting in the Blade of Marmora episode, he was being beat down so badly, but he still never quit because he needed to find out about his past and understand who he was/where he came from.
Not to mention that when they do overcome their obstacles, they both just look so proud (and really smug) of themselves LOL
I personally think that those traits alone could really make them the cool space ranger partners that Jeremy was talking about too.