I believe fifth wave ska is spanish-ska. There are many debates about if there is a fourth wave ska and nth wave ska. I say it's agreeable that Streetlight Manifesto defined fourth wave ska has ska heavily influenced by horns.
Fifth wave ska probably should be spanish-ska because if any one attended spanish-ska is it's own culture and it is big community already.
Fifth wave ska, La Resistencia, La Banda Skalavera, Red Store Bums, La Panteon Rococo, etc.