TrueNorth31 wrote:
In terms of being a good teammate most of them have raved about him just being one of the guys. Basically the reason many players didn't play on the 2017 U19 team had to do with most of them being in Summer School at the time ( a very common circumstance for many D1 guys ) not that they didn't want to play with Barrett. I'd say his winning pedigree that goes with everything he seems to touch ( U19-Monteverde-Duke) is something to be embraced, not shunned.
So yes - I'd say get off that ledge.
Just to add to that, because it's a story that has been running around for a while, so it's important to try and understand whether there's some truth to it or whether this is "fake news". 
Mojo, you said: "There were already loads of rumors from the youth teams that other top prospects did not want to play with Barrett due to his selfish habits (I believe those rumors now)".
So let's take a look at that. To clarify, I'm not an insider, so this is all from following things online and putting the pieces together:
The top guys who did come were Wigginton and Kigab (what a great tournament he gave!), who both seemed like they had no problem with RJ. Neither did Djuricic, Shepherd, Darling, or any of the other guys on that team.
As for SGA, NAW, Akot, and Brissett, I think TrueNorth is right about summer school commitments, and some have said that. All were about to start their college career. None of them (except for Akot) had played with RJ before, so I don't think they could have had any beef with him. There was no indication of that in anything they said.
Nembhard didn't join the team because he was injured. Same I believe for Llewellyn.
So that leaves us with three top prospects: Simi, Iggy, and Lu Dort who were conspicuously missing from that championship without any explanation. Dort never played with RJ before. Iggy and Simi did in two previous championships. But I think for all three there's a much more straightforward explanation -- the feud that was going on that summer between the two primary Canadian AAU programs -- Uplay and CIA Bounce. It wasn't so much out in the open, but the hostility was quite eminent. 
Now, let's look at the actors in that feud to try and understand what went on and how it might have affected the national teams (not just the U19; also the U16). 
On the one hand, Uplay, the new kid in the block, had RJ playing for it (also AJ Lawson) and Rowan Barrett was involved in the program as well (which I think was a mistake for someone in his position). On the other hand, the much more seasoned CIA Bounce had Simi and Iggy playing for them. But not Dort. So how does he come into the picture? I believe that the key figure to understand the connection here is Tony McIntire. Quite a central figure in Canadian youth basketball and the dad of the Ennis brothers. He was the head coach of CIA Bounce and the founder of that program. But he's also the director of basketball operations at Athlete Institute, with its two flagship teams -- Orangeville Prep and Athlete Institute. And here's the connection: Iggy played at Orangeville Prep at the time and Dort was just about to join Athlete Institute. Curiously, Dort spoke enthusiastically about joining the U19 team just a month prior to the championship, and then, without any explanation just didn't come. And by the way, Brissett also just graduated from AI.
So what makes me think this is actually the reason and not some personal disliking of RJ?
What happened with the U16 team that year. In very similar fashion, top-5 guys like Addison Patterson, Matthew Alexander Moncrieff, and Josh Hemmings were all expected to be part of the team but without any explanation were not included in it in the last minute. Patterson even spoke enthusiastically about joining the team just a weak before the championship, but then it was never reported why he didn't come. Once again, what do all three have in common? All played at the time for either CIA Bounce, AI Prep, or both...
To reiterate, I'm not an insider, so this is just me putting the pieces together with some common sense. But I think this is a much more reasonable explanation than guys having such a serious problem with RJ that they wouldn't come to represent Canada. The only one that might have had some personal issues with RJ is Simi, who left Montverde a year after RJ came and there was a bit of a rumble about an altercation between the two during the U17 championship in 2016. But both publically denied that they have any serious bad blood between them and I tend to believe that.
So that's that, and I hope we can put this story to bed. I certainly see no evidence that the guys in Duke have a personal issue with RJ (He and Zion are truly best buddies).