Dorje Shugden was pivotal in HH Dalai Lama's escape from China. Through oracle, Dorje Shugden gave the precise and exact route which HH Dalai Lama had to take in order to reach India safely. Whereas Nechung gave another route.
Dalai Lama was aware of this. So even the Chinese send 50,000 troops, Dalai Lama was unhurt and because of this, we are able to receive all the sacred teachings including Dorje Shughden practice now.
I agree with TK, Dalai Lama has done so much in spreading the dharma in all directions around the world. And as the situation is today, looks like Dorje Shugden's practice will also be spreading around the world becasue of the ban and the controversy, DS practice is particularly strong in China also.