“…Inflection in 2.sg is characteristic of all C-agr varieties, and we restrict our discussion accordingly to this common ground. 8 In terms of formal linguistic analysis, C-agr involves the checking of uninterpretable phi-features (u-Phi) in the CP domain by a maximally local nominal element, for example, a subject pronoun, from which it gets interpretable phi-features (i-Phi) for person and number (Bousquette, 2014;Carstens, 2003;van Koppen, 2005;Putnam & van Koppen, 2011). 9 Historically, the innovative inflectional suffix on complementizers is derived from a reanalysis of C-oriented cliticization as an inflectional affix (Bousquette, 2014(Bousquette, , 2015Fuß, 2004Fuß, , 2005Fuß, , 2008Wratil, 2014); the analogical extension of innovative affixes specific to the Wackernagel position (i.e., second) in the left periphery of the clause (cf.…”