Okay, I recognized something new again. Sorry for the poster clutter.
Track 5 in my link is another cover of a KOF '98 song, though, again, very corrupted. "In Spite of One's Age," the Father's Team theme. This is very odd, considering that the father's team was not in the original 96.
https://www.youtube.com/watch?v=xbEB_dKS2_4Hummer Team always seemed to port games that were regarded as smash hits when they were released, or game entries that differed from previous games in the series. KOF '98 did so in that it had no storyline and was just a reunion of sorts of all the best characters. Makes me think that they were indecisive whether to port 96 or 98, and decided to go with 96 as it was the older one. However, they seem to have liked 98 so much, and still wanted to port it over, that they wrote 'King of Fighters 98' in the ending and added a few tracks from the game in. They may have chosen to use the AoF '98 theme in the game due to the fact that AoF characters were to appear in the game (though only Yuri made it to the final game) and the Father Team theme went unused as the team wasn't in '96.