Since Tigrean has no representation in both houses especially in House Federation that will deliver decision on their affairs, its decision will not acceptable to them. This unilateral way of managing conflict will only further complicate problems!
But dont forget TPLF, OLA, Fano are worst than PP. PP is ineffecient and dominated by opportunists, as it was made by TPLF, because most of PP members are ex-EPRDF. OLA and Fano has no pan-Ethiopian plan. OLA is dominated by Oromo extremists and Fano is dominated by Amhara extremists. What do you have?