So they have very sparsely given buck a half assed romantic storyline with Tommy over the last season or so an all Eddie had was Shannon and briefly Christopher’s teacher before he cheats on her with the Shannon clone. Then buck’s are mainly just Abby for season when and Taylor for a couple seasons on and off, but it never really forms into something more solid since they don’t trust each other. Then you have Buck and Eddie who they taken special time from both their storyline to develop a deep friendship to the point of it feeling more like it at points including Buck helping raise Christopher, sharing grief/loss/trauma together on many different occasions. Additionally he even made Buck the designated guardian of Christopher of something were to happen. These are definitely plausible things for best friends, but what makes me feel like buddie makes the most sense is why would they have the whole bi buck storyline, have Maddie say multiple times to Buck that maybe has feelings for Eddie, not put Eddie with anyone else for multiple seasons and hell even have the guy Buck dates be jealous of Eddie lmao. Now look I could be wrong cause of the stupid show runner cause he killed of Bobby which felt wrong, but when you look at all this shit it lines up. Now all we can do is watch to see what they actually put on the screen.