After re-reading this thread a few times... My understanding is that what Lama Zopa is saying is we each need to make our own choices.
He has given points in both aspect, reasons why he stopped practising DS (publicly) and hence adviced Kopan to do so. He has made it clear that it is mainly to fulfil HHDL's wishes. Nothing was mentioned that DS is evil or a demon or is wrong practice. He advices firmly not to disparage any of the lineage Gurus/one's Guru/ even Dorje Shugden as he mentioned
"This does not mean that Pabongka Dechen Nyingpo, His Holiness Trijang Rinpoche, and His Holiness Song Rinpoche have made mistakes. It does not mean they are wrong. Nor does one have to look at the protector as evil. For us ordinary people it is difficult to judge, because we cannot see these lamas ’ minds.
Another side of the teaching is that it is mentioned that the protector is an Arya Bodhisattva, a manifestation of Manjushri. So, then, there is also the risk of our creating very heavy karma in that context.." In a way Lama Zopa still have great Guru Devotion and faith in the Lineage masters and does not only advice it but has shown it through his actions as we can witness from the video showing him doing prayers in HH Trijang Rinpoche's stupa.
It also shows these are time most difficult not just students but for Lamas as well as they need to show the right examples. It seems like there are 2 sides/choices presented...
1) Lamas who follow HHDL wishes and stop DS practice and 2) Lamas who continue DS practice
However the advice presented from Lama Zopa is clear that both must thread the middle way by not having wrong view/faith towards HHDL/their Gurus, to not disparage HHDL nor the Lineage Lama's such as Pabongkha and Trijang Dorje Chang not Dorje Shugden. That is quite clear and seems to be the heart advice as it is also the advice from Trijang Dorje Chang when in his previous life predicted and pre-empted this situation and how we should react towards written down by HH Trijang Dorje Chang in pg125 of Music Delighting An Ocean..
http://www.dorjeshugden.com/articles/musicdelighting.pdf We may not seem to understand the ultimate goal from this confusion now, but surely the divine minds has a plan of great benefit and all will be revealed in good time... hopefully soon.