This is a quote from Kelly:
" Talking to Giancarlo we have a similar idea about how we’d like the team to play; with intensity, aggression and dominating possession. [...] In Brazil as a footballer and coach I have learned the players need the freedom to play and use their creativity. [...] I think we’re going to motivate the players to be free and create. "
https://aleagues.com.au/news/wellington-phoenix-news-assistant-coach-kelly-guimaraes-who-is-he-role-latest/
So, I don't think it's the fundamental football belief that's the issue from Giancarlo, and hopefully Kelly has the ability to help him achieve the vision.
" Talking to Giancarlo we have a similar idea about how we’d like the team to play; with intensity, aggression and dominating possession. [...] In Brazil as a footballer and coach I have learned the players need the freedom to play and use their creativity. [...] I think we’re going to motivate the players to be free and create. "
https://aleagues.com.au/news/wellington-phoenix-news-assistant-coach-kelly-guimaraes-who-is-he-role-latest/
So, I don't think it's the fundamental football belief that's the issue from Giancarlo, and hopefully Kelly has the ability to help him achieve the vision.