By SI Staff Forecasting the futures of Kevin Durant, Donovan Mitchell, Kyrie Irving and Russell Westbrook. The NBA rumor mill is still swirling with Kevin Durant, Donovan Mitchell, Kyrie Irving and Russell Westbrook possibly all available. The Crossover staff makes its predictions on where each player will be at the start of next season. When the season starts, where will Kevin Durant be playing?Chris Herring: Toronto. I still feel like the Raptors have the most promising roster with players who are both young and affordable enough for Brooklyn to want to take on. (Jaylen Brown is great, but d…