Dwight D. Eisenhower is introduced in the Cold War: Part 1 as being really hard to draw and two models. The thing is, Oversimplified has shown most people as stick figures with heads from pictures superimposed at the top like William Chamberlain, Alois Hitler, FDR, Harry Truman in the Second World War, Part 2,George Pearce, the Korean and Vietnam dictators, etc. So why didn't he do that?
Because from this video onwards, Oversimplified did away with that style and drew very important characters with full facial features and everything. He adopts the stick-figure style with Yuri Andropov and Konstantin Chernenko in Cold War Part 2, because they were really old and quickly died.