If Lagosian politics are about benefiting the people of Lagos - why are Lagosians (like the Oba) threatening to throw Igbo Lagosians into the lagoon? Moreover, if Lagos is the main port of Nigeria (to the detriment of all others) goods being moved across Nigeria have to travel through Yoruba-populated areas. Infrastructure and support services will have to be built up within and outside of Lagos to facilitate this. Those measures primarily help Yoruba people. Again, to the detriment of all others.
Using an isolated incidence doesn't mean a thing, as if Lagosians of any background haven't had to face worse things than that because of local politics (see APC-PDP in Lagos).
You have failed to show me where Yoruba elites have stopped the development of other ports in order to benefit the Yoruba as a group. You have shown why they might do this but you can't show me any evidence that they did, I'll be waiting.