I'm not sure if Axel is clear on the ID rule, which has not changed at all since the beginning.
ID means that one person has identified the song. For a competitor to lose all points for the submitted song, it would have to have 6 red ID tags.
Every competitor will get points for every song posted, unless a song is ID'd 6 or more times. It just means that if you post a song that too many people have heard before, you don't score very high for that one song. All your other songs remain unaffected.
Also, ALL your posted songs count to the final score. If you post 6 songs, the total score for all 6 songs will be added up. If you post 2 songs, you will only be scored on those two songs. So even the guy with the best voted single song (Don Julio so far) is not assured of winning. It's the competitor who has the most, average best, most unheard songs who will win.