It's the same. You're saying you haven't seen enough of him to think he's a good player. Some people think they have. You say he doesn't adequately fill his position. Some people think he does. Sure, there are small differences that can be objectively measured, and subjectively, I agree that Green was already a solid part of the rotation the year before. But a fair number to people saw (and still do) him as the weak link on the team that could (and needed to) be upgraded with Re , Ellis, Jack

and a whole list of players. You don't trust Joseph, and those people didn't trust Green. It's the same objection, with potentially stronger support.
And you keep ignoring the reasons people give as to why they think Joseph will be better next year. It's not just because it's young, and you know it. You can disagree with those reasons all you want, but don't keep acting like they weren't given. Diaw is at the end of his prime as a big, and Bonner is about as good as he ever was. We all hope Pendergraph and Baynes are better than Bonner, and it would be great for them to be good enough to challenge Diaw. But that's not the same thing as being against bringing in a vet to replace a player who did exactly what was expected of him last season and who has the skills and lower-level production to suggest he's going to be able to handle much more responsibility next season.