Only minor partially. The topography (where the himalayan shield meets Assam and cascades into the mountains and valleys) makes this hypothetical lot harder compared to upstream brahmaputra retention/diversion where the steadier Tibetan plateau still exists.
Most of their claim originates from Tibetan Empire + Tibetan dynasties historic control and influence over the area, especially Tawang.
But then that raises the uncomfortable existence of the Tibetan Empire and Tibet separately to Han China for long periods of time....including during the time when British tried to settle the border here w.r.t Tibet in early 20th century, excluding Qing from those negotiations (seen as foreigners by lot of Han anyway) from it.
Hence they don't really press the issue as much as the strategic road area w.r.t Aksai Chin.