Schematic illustration of two possible evolutionary pathways linking LRDs and BBQSORS discussed in Section 3.2.1. In Path I, BBQSORS represents the final stage of high-z LRD evolution, in which the cooler SMBH envelope (T ∼ 5000K) evolves into a hotter, bloated envelope with T ∼ 10⁴ K while the system becomes less obscured. In this stage, broad-line region emission (e.g., Mg II and C III]) and radio jets become visible, and X-rays can leak through an optically thin channel. In Path II, the envelope of BBQSORS arises instead as a result of intense inflow triggered by a merger, and mimicking low-z analogs of LRDs.