On the basis of both morphological and lexical evidence, Lai et al. (2020) add the extinct Tangut language to West Gyalrongic.
[1] Beaudouin (2023) through a morphosyntactic analysis based on phonetic correspondences, shows that Tangut should be included within the Horpa languages.
[2] Sagart et al. (2019) estimate that West and East Gyalrongic had diverged from each other about 3,000 years before present.
As a result, based on both historiographical and linguistic evidence, Lai et al. (2020) place the ultimate homeland of the Tangut in present-day western Sichuan.
[1] However, the Tangut were already rulers of the Dingnan Jiedushi from 881AD, which indicates another scenario, as they could not migrate to a place they were already situated.