How can SukkhaVipassaka enlighten Nibbana without Appanā Jhāna.

SukkhaVipassaka can enlighten Arahatraphala without order from 9 samapatti. This kind of people must has less 5 hindrances from his birth to enlighten in 7 years, or more than that for TanhaCarita MandaPuggala (too much hindrances who avoid to practice Jhana and no knowledge in Paticcasamuppada). However, most Arahanta attain 6 Abhiñña as well according to Theragatha, so I think Arahanta try to practice 9 Samapatti after enlightenment too. The same as Arahanta try to memorize Buddha's teaching which commentary commented BhandāgāikaPariyatti (Nikaya Memorizer) is duty of Arahanta directly