It's a good question. I think (and spoke to Ken about it also) that the short answer is no. First of all, the El Nino tends to influence the tropical cyclone activity, through the energy provided by the warmed SST and its increased atmospheric moisture, rather than the storms significantly influencing the El Nino. El Nino has much more anomalous energy than a few extra tropical cyclones or hurricanes in the Pacific. The circulation around these cyclones cyclones tends to reinforce the wind anomalies associated with El Nino: westerly low level wind anomalies in the tropical latitudes of the Pacific due to the circulations around the storms in both hemispheres. (In the northern hemisphere, the counterclockwise circulation around the cyclones contributes to stronger than average westerly winds on the equator side of the cyclone, and in the southern hemisphere the clockwise circulation has the same effect.) So an excess of cyclones appears to be in concert with El Nino rather than opposed to it. There may be other mechanisms through which the cyclones may inhibit the El Nino slightly, such as the north-south (or south-north) temperature gradient spanning the subtropics of each hemisphere through the equator. I cannot comment on that -- other scientists are welcome to. The extra cloudiness from the cyclone likely does not extend into the deep tropics where the El Nino is occurring, as the cyclones stay well outside of the equatorial belt.