Toronto, league sources say, stepped away because of concerns about Porziņģis’ long-term health. The Wizards, sources say, went ahead with the trade on their end — to add to the bluntness — because they were as eager to ship out Spencer Dinwiddie and Dāvis Bertāns as the Mavericks were to move on from the idea that Porziņģis could be the ideal co-star for Luka Dončić.