Pundit the most corrupt people are not poor - because you need power to access the coffers and enjoy impunity. We know this for a fact. Most politicians, executives, administrators, cops, are not poor but greedy.
However I believe the worst form of corruption is the democratized variety that Nigeria, Afghanistan, etc - and increasingly Kenya have. You see a problem like say drought & famine - it's spreading as ASAL climate encroaches on the deforested areas. The deforestation - and thus the deaths - is caused by corrupt forest officers, chiefs, APs, etc. Say again the high road carnage - as corrupt cops & drivers significantly contribute to this - the 000s of dead, crippled or orphaned would hardly care if the economy still grows despite the deadly graft.
On corruption and development, the success of highly corrupt countries which then shed off the vice is questionable. How many are there really? In the overwhelming majority of success stories, the monster is slayed first, then rapid growth follows. China and the Asian Tigers as good examples. Almost the entire West falls here too.
Few developed countries are deeply corrupt. Russia is unable to achieve optimal status - as corruption impacts security, very low FDI, low productivity despite high per capita education, etc. Analyses has shown corruption is the biggest impediment to Russian prosperity and not Western/US sanctions. This also applies to Indonesia - stagnation at some point due to corruption and her nefarious symptoms.
Perhaps Kenya is special, but we are yet to see that. If we didn't have insidious graft - such as has rapidly happened with Jubilee - we would develop faster, better and sustainably. And avoid other by-problems like inequality, insecurity, carnage, drought, discord, name it.
Kenya has not demonstrated that a country can prosper despite insidious graft - Pundit you are wrong on that. It's far too early in the economic scales and larger scheme of matters national development to make that call.