I think the root is χεϝ-. Present χέϝω>χέω. Aorist ἔχεϝσα>ἔχεσα>ἔχεα without contraction, which would obscure the personal endings.
I think the root is χεϝ-. Present χέϝω>χέω. Aorist ἔχεϝσα>ἔχεσα>ἔχεα without contraction, which would obscure the personal endings.