Trask (1995): "... , it seems highly probable that these two morphs ['-ki' eta '-ts' datiboak] were originally independent elements ..."

 Atzokoan genioén ze:

Trask-en ikuskeran, flexio indirekto horiek [kin "-ki" eta "-ts" datiboak] akaso etorriko zirén ti forma aske zaharragoak (esan nahi baita: preposizioak), zein aurrena lotuko zirén ki adizki finitoak (jokatuak: "dakar - ki - gu"), eta soilik gerora reinterpretatuko zirén nola aditz-erroak ("ekarki dut")

Trask-ek (1995) honela jarraitzen du:

... , it seems highly probable that these two morphs were originally independent elements which eventually came to be incorporated into the participles of certain verbs, ... [Trask, 1995:239-231]

Bere analisian, beraz, ... , it seems highly probable eze bi morfema horiek ('-ki' eta '-ts' datiboak) etorriko zirén ti elementu independenteak.