On what basis were Iyer's captaincy credentials judged suddenly: Ashwin

Speaking about Shreyas Iyer reportedly replacing Suryakumar Yadav as India T20I captain, ex-India all-rounder Ravichandran Ashwin said, "On what basis did you suddenly judge his captaincy credentials?" "Iyer definitely warrants a discussion for a place in Indian T20 team. But is there any hole...team?" Ashwin stated. "Except for spin-bowling, there are no holes. So why make this change?" he added.