Who's missing?

I took these photos this morning in the souvenir shop at the Chiang Kai-shek Memorial Hall. The top photo shows, from left to right, President Ma Ying-jeou, Vice President Vincent Siew, Chiang Ching-kuo (Chiang Kai-shek's son and successor) and Dr. Sun Yat-sen.


The second photo features, from left to right, Chiang Kai-shek, Madame Chiang, Chiang Kai-shek again (well, it is the Chiang Kai-shek Memorial Hall) - this time looking tanned - and Mao Zedong. Mao is, of course, the guy who pushed Chiang out of China and onto Taiwan.

Two of Taiwan's six presidents are missing. Lee Teng-hui, president 1988-2000, and Chen Shui-bian, the man who succeeded him and held office until 2008. Chen isn't a popular figure these days (he's in jail after being convicted of money laundering) but why on Earth isn't Lee represented?