MCA Inc.'s strategy to confront parent seen as big gamble.

Reports on plan of MCA Inc.'s top executives to confront parent company Matsushita Electric Industrial Co. officials to demand right to buy back control of MCA. Support to MCA's bid by Hollywood moghuls; Views of experts on MCA's strategy; Views of Matsushita on issue; Threat by MCA chairman Lew Wasserman of leaving along with Steven Spielberg and David Geffen; Information on their contracts; MCA's plans to acquire General Electric Co.'s NBC; Details on plans.