http://www.mydaytondailynews.com/spo...LS9GGlJBWb4NJ/
"A couple of players, freshmen Trey Landers and Kostas Antetokounmpo, stopped by the offices early Tuesday afternoon. They seemed comfortable with the new staff. At a quick glance, one would have thought they had been together for years, not six days."
The article confirmed it for me... Kostas is staying.