Are non-Gelug teachings complete paths to enlightenment?

Of course! Of course we believe that every Nyingmapa and Kagyupa have their complete path. Not only Gelugpa. I believe that Nyingmapas have a complete path. Of course, Kagyupas are very special. We very much appreciate the example of Marpa and Milarepa [in the Kagyu lineage]. Milarepa showed the best example of guru devotion. Of course the Kagyupas as well as the Nyingmapas and the Sakyapas, have a complete path to enlightenment. Many Nyingmapas and Kagyupas practice very sincerely and are not just studying intellectually. I think that some Gelugpa practitioners need to follow their practical example. But we don’t need to mix our traditions. Each tradition has its own uncommon good qualities, and it is important not to lose these. We should concentrate on our own tradition and maintain the good qualities of our tradition, but we should always keep good relations with each other and never argue or criticize each other. What I would like to request is that we should improve our own traditions while maintaining good relations with each other. (Geshe Kelsang Gyatso, An Interview With Geshe Kelsang GyatsoTricycle: the Buddhist Review, No. 27, Spring 1998, p. 76)

[From Gen-la Kelsang Khyenrab:]

The New Kadampa Tradition cannot be sectarian; nowhere in NKT literature, teachings or Centres is there a sectarian view promoted. Instead the realized masters of all other traditions are praised; many examples of this can be found in the books of Geshe Kelsang—everyone can see this quite clearly. So how can the NKT be sectarian?

The NKT cherishes its particular view and practices like a family cherishes its special values and precious heirlooms passed down the generations; we are very happy that other traditions with their own special characteristics do the same. We rejoice in all traditions and lineages coming from Buddha. We recognize them as methods for attaining enlightenment and do not discriminate negatively against any of them. (Gen-la Kelsang Khyenrab, alt.religion.buddhism.tibetan, 23 January 1998)