If I had to guess... Lucci had the rest of the CP9 protecting him post-Enies Lobby (from the cover story), which is why he didn't get captured. WW, on another hand, was presumably working alone. If WW had friends among the CP9, they could have helped him just like in the cover stories.
Another thing is, Lucci probably told the truth about the EL incident to his higher higher-ups so both him and Spandam were to blame, but Aokiji as an admiral is a laxed creature so he probably gave no punishment to CP9 cuz he took the blame for everything, which can be used to explain why the WG vouched for Akainu instead of Aokiji when choosing for the next Fleet Admiral.