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After the 1977 season Shadow entered into a sharp decline. Jones left to join Williams for 1978. In the same period a majority of their staff and their sponsor Franco Ambrosio left to form their own team, Arrows, taking the young Riccardo Patrese. Despite sponsorship from Villiger tobacco and the signing of experienced drivers Clay Regazzoni and Hans Stuck for the 1978 season, results were poor. In 1980 they were absorbed into Theodore Racing, but Shadow's first ground effect chassis was largely uncompetitive, only once qualifying a car in seven races. Sponsorship dried up and after the seventh of the year's 14 races Teddy Yip wound up the Shadow team.