I've edited the thread title to reflect that it is a question being asked, not a statement.
Before we swing the axe to wildly, Oastler isn't the lead designer on the Jaguar. The heads of department at Jaguar are as follows.
Ian Pocock (Director of Engineering) Ben Agathangelou (Head of Aerodynamics), Rob Taylor (Head of Vehicle Design), Dr Mark Gillan (Head of Vehicle Performance), Dr Ian Pocock (Head of Engineering)
Malcolm Oastler's role is Chief Engineer, which IIRC is not a design role, but a pure engineering role. In other words, a race engineer works with the design that has been produced and aims to get the best out of it. His role at Jaguar is to improve the reliablilty and working efficiency of the car.
http://www.jaguar-racing.com/frame.cgi