I don't know what NKT is up to, really. They are against the tulku system or Lama policy, I respect them for this is what they wish for their Kadampa organization. But they cannot deny the fact that this system is there, and was established and had been 'in use' till now and is still working.
You can read more here, you may not have read this before: http://www.dorjeshugden.com/all-articles/dharma-readings/the-tulku-system-is-crucial-for-the-lineage-to-endure/This also does not mean that Geshe Kelsang Gyatso do not believe in tulkus/ reincarnation system. In fact, it is well known that Geshe Kelsang Gyatso claims he has recognised the reincarnation of his mother in the daughter of an English couple, Ruth and Ron Lister. Geshe Kelsang Gyatso's uncle was the Choyang Duldzin Kuten Lama, a Dorje Shugden oracle of Gaden Monastery, who had visited and took trance in Manjushri Institute.
Prajna, these teachers mentioned by you (from the Trijang Buddhist Institute websites) are highly respected teachers and some are abbots/ ex-abbots of the Three Great Seats (Gaden, Sera, Drepung). It is unlikely that the 3 monasteries will go along accepting a fake incarnation.
Besides, the 101st Ganden Tripa Lungri Namgyal Rinpoche also recognised Trijang Chocktrul Rinpoche, authorizing Trijang Buddhist Institute of Northfelid Vermont to “represent and transmit the teachings of the Gelug order of Tibetan Buddhism in the United States.”
He also stated catacorically that Trijang Chogtrul Rinpoche (“having been educated in the teachings of the Gelug order of Tibetan Buddhism, and officially recognized by His Holiness the 14th Dalai Lama as being the incarnation of the late Trijang Dorje Chang, Tutor to the 14th Dalai Lama and one of the greatest twentieth-century Buddhist masters of this order…”) is fully qualified to act as director of TBI.
So, the whole of Gelugpa recognises Trijang Chocktrul Rinpoche. But again, NKT is not Gelugpa, so...
Here is the letter,
taken from the post 'Ganden Tripa Authorizes Dorje Shugden Practitioners to represent the Gelugpa tradition'
http://www.dorjeshugden.com/all-articles/the-controversy/ganden-tripa-authorizes-dorje-shugden-pratitioners-to-represent-the-gelugpa-tradition/