I think Cobyn and Vega compliment each other well. I see Vega as someone who struggles to enjoy things they aren't receiving external validation for doing. They dropped cosmology in favor of investigating, and the specific reason they highlight for their doing so is because of the amount of attention they got from it. Her feeling like someone to be praised and prioritized by other people is so important to her that the moment something gave her that feeling, she decided that thing was her life's very purpose. He probably still has a genuine passion for cosmology, but now that he's found something that's been proven to make him important in others' eyes, he automatically feels more fulfilled by that thing. Damn his actual passions to hell, that didn't get him any attention..........
Cobyn is the polar opposite of this. He says he feels ignored whenever he talks about gardening because people rarely listen, and he says no one cares about gardening these days or something along those lines while explaining how his shop wasn't doing well. He still dedicates himself to gardening. He doesn't need external validation to be motivated to do it, it's just something that makes him happy and that's that. Obviously it sucks he has no one to express his love of gardening to, and he needs business to come into his store so he could keep it open, but none of that manifests as insecurity(?) like it does with Vega. It moreso manifests as him being extra appreciative of people who do listen to and support him, but not really holding it against himself or anyone else if they don't.
Vega and Cobyn are both in the dilemma of no one caring about their passion, but Vega takes it WAY harder than Cobyn. To the point where she changes what she does with her life because attention is more important to her than passion. Where Vega needs validation to be satisfied with what they do, Cobyn just greatly appreciates it.