Prospective developers for a new sports and entertainment complex were questioned by Mayor Kevin Johnson’s volunteer task force Wednesday night. The 12-member task force, which includes real estate, finance and communications executives, asked numerous follow-up questions after listening to presentations by Matt Haines, Doug Tatara and Ali Mackani. Haines, who owns Bistro 33 in Midtown, told the task force about his proposal to build the complex in downtown’s Docks Area. “This would be a direct front-door” to Old Sacramento, he said. Old Sacramento is north of the proposed area. Task force project coordinator Matt Massari wrote earlier that Haines’ Docks Area project would be “adjacent