The Old Man did not have Ministry, a portfolio nor any accountability from 1990 to 2015 - 25 years. In 2011, the position of Minister Mentor was abolished and therefore did not have even a title for the last 4 years. He however continued to stay at Istana, had the largest security detail and travelled the World. The only official position he held was that of an MP and no ordinary MP is entitled to these privileges. Though there is no law in Singapore like the US Presidency where ex-Presidents are entitled for these privileges , he continued enjoy these privileges because he felt he was entitled to it. When Devan Nair was kicked out and a pension was proposed the Government had to go to Parliament to get approval as there was no such provision for the President.
So when one talks about integrity they need to look at this man as your reference first before anything else.