In the greater scheme of things, the individual makes little difference, example, soccer is a team game, but one player can have large profound in influencing the team's morale. Singapore's infrastructure is the result of many contributors, city planners, architects, civil engineers, construction crews, cement suppliers, coolies, etc. We can say that LKY's vision helped create the works that put all the above into play, but to say that he did all that, is somewhat stretching the truth, but for reasons of brevity, it can be accepted, that LKY built modern city, just that by saying that, we've left out the toil and sweat by all the lowly paid construction workers working their guts out. I don't know if you remember indian workers who lived in "PUB quarters", residences built for tamil workers who worked for PUB employees and their families? Nobody today gives any recognition to those chaps who dug the roads, laid the concrete foundations of many prominent buildings in the city-state, but everyone knows that LKY built Singapore. Well, that's the truth, and that's politics.
LHL, I don't know what's so great about him other than being the lucky son of the country's "founder." He was thrusted into his current position by his father's crafty manoeveuring and politicking. No one in his party ever contested him for that leadership position because they all respected his daddy. None of the military big wigs had the ambition to challenge his position and he cruised easily to sit on top of everyone else. So, I do not know what greatness is there in somebody who never had to do anything difficult in his life. Perhaps he should do something controversial like reversing his daddy's ban on chewing gum.
Cheers!