I think we (the DS-practitioners) should leave the students of Tsem Tulku in peace, concerning this matter.
Since it is obvious that Tsem has taken "the swiss option" and does not take sides when the Geluk-world is polarizing itself into two camps, I feel that we should respect his explicitly expressed decision, and furthermore be very very sensitive to the situation of his disciples. If one "forces" or even draws an opinion from his students, one has in fact caused a rift between a Guru and his disciples - if Tsem is non-committed and non-aligned in this matter, then let's allow just that very position also to his students as well; let us not draw divides into Tsem's sangha.
Tsem was trained by Zong Rinpoche. It is certain that Tsem knows what he is doing. Let us not worry. Let us not cause trouble in his sangha by pressing this issue.
Please.