To be fair Oubre said in his interview that he had issues with understanding Igor when he first got to the team. Though it does seem that he was able to adjust and it is no longer an issue.
His English isn't so broken that it can't be understood, but it could take a little bit of time for guys to adjust.
I read that same thing and I interpreted it differently than that. I took it as Oubre had trouble understanding the role that Igor wanted him to play, not he had trouble understanding him speak. I could be wrong but it was what he said after that initial statement that made me feel that way. He started talking about once he understood things really clicked for him and he was able to make more of an impact on the team. I had the initial thoughts it was language until I read that next part so it could be either one, I'm not sure, but I can see how it's taken the other way.