I'm trying to find the interview, but Pras explained it really well. Nowadays credits are really long on songs because anyone who had any minor input gets put on there. This is to prevent some of the legal headache from the past. Lauryn wrote all those songs in terms of lyrics and melody and others came in to help with instrumentation. She was young and didn't understand that a lot of the legal paperwork re: who did what needed to get sorted from the start. I think the record label also pushed to have it say that she did everything.