Well possibly not. Furthermore they certainly didn't have Right Mindfulness, yet they obtained Jhāna.
Keren Arbel's Jhāna
Re: Keren Arbel's Jhāna
“Knowing that this body is just like foam,
understanding it has the nature of a mirage,
cutting off Māra’s flower-tipped arrows,
one should go beyond the King of Death’s sight.”
understanding it has the nature of a mirage,
cutting off Māra’s flower-tipped arrows,
one should go beyond the King of Death’s sight.”