I think all teams strive for cohesion, whether "chemistry" or "ubuntu," etc. However, it always seems to be the winning clubs that talk about chemistry/ubuntu.
So, I tend to think that Winning CREATES ubuntu/chemistry, but that the players/media, in creating their story/explanation of the season, then retroactively site the ubuntu/chemistry as the CAUSE of the winning, because it makes a better emotional narrative.
For example, we did not win the title this year, so it must be a lack of chemistry (it couldn't be a lack of talent/skill, could it?). Then, it's easy to point to the Perk trade and conclude that that was the moment chemistry was abandoned. However, if we HAD won it this year, i bet we'd see a lot of stories about how that very same trade caused a lot of anger and frustration, and brought the team closer together, causing better chemistry.
That's what is so great/laughable about sports writing: these writers/fans take an outcome, then retroactively pick various signs/moments from throughout the season to explain why a team ended up winning or losing...when such moments can be equally used to explain either a win or a loss, it just depends on the outcome.
So, in sum, we abandoned "ubuntu" as a narrative line the moment the C's just weren't good enough to win anymore.