Monte Clark mortgaged San Francisco's future to bring Jim Plunkett home to California. The price: two 1976 first-round draft choices, a first and second next year and backup Quarterback Tom Owen. Now there are indications that Plunkett, who as a rookie in 1971 passed for 19 touchdowns at New England, may have lost both his live arm and his flair for the game. Apparently concerned about past injuries to his shoulder, Plunkett seems to be playing scared; he has not shown an ability—or a desire—to stand up and withstand a rush. "You've got to play this game aggressively," says one coach, "and Plunkett isn't doing that anymore." If Jim can come back, the 49ers' quarterback problem will be settled for the first time since John Brodie's heyday in the '60s. If not, they face a bleak future.