Several opposing league executives are convinced that the Clippers, despite being considered by many as the deepest and most talented team in the Western Conference, are committed to making several upgrades before the NBA’s Feb. 6 trade deadline. “They’ll do something,” one Eastern Conference executive says. “Their second team is great. They’re nervous about their first team. Is [Ivica] Zubac a playoff player and can [point guard Patrick] Beverley stay healthy? That’s what they don’t know and that’s what makes them nervous.”