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1st 2nd 3rd
*-awV | *-ewVs | *-et
*-Vwmu | *-Vwsi | *-VntuThe similarities between the endings and nominal endings leads me to speculate the source of the system: Pre-Proto-Eastern might have used a directional system, having more adverbial force than pronominal, which was later reinterpreted to be a personal system.
This directional system may have yielded three types: locative (here, there), dative (hence, thence) and ablative (hither, thither), and these morphs may have at one point related themselves to the nominal endings of those cases. The most prominent is -aw-, finding itself in 1st and 2nd person singular. The order of the morphemes was never set, and might have originally been *-aw-V, where V was a themantic ending, based on the type of verb (cf. this). We'd then have three directional infixes, *-aw- for the locative, *-mu- or *-nu- for the dative, and -si- for the ablative, giving us the endings: *-aw-V-, *-nu-V-, and *-si-V-. When these became pronominal in force, they lost both the directional and adverbial force, being loosely refered to the antecedent. A plural, by analogy to nouns (with a marker in *-u- or *-w- which possibly might be from *-uy-. The morpheme order may have been regularised in the plural, or perhaps -V-directional- was seen as a plural construction, while -directional-V- a singular one).
The history of this system is thus:
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*-awV, *-ewVs < *-aw-V
*-Vwmu < *-V-uy-nu
*-Vwsi < *-V-uy-si
).
