Recent work by Karl et al. indicate that there actually hasn't been a hiatus in warming (see NOAA press release).  And in any case, 2015 is quite likely going to be the warmest year ever observed.  Therefore hard to see how this is acting to influence impacts  The reality is that climate is complex and far more than just El Nino, so it should't be surprising if some impacts vary from El Nino to El Nino.  

http://www.noaanews.noaa.gov/stories2015/noaa-analysis-journal-science-…