"Welcome back to the mafia, Dazai-kun..."
The brunette felt his heart sink as he uncrowded his legs, standing up shakily.
"President...May I confirm that you were the one who made this deal?" He made his voice sound even. He did not miss the concer...
Despite that, Sigma's death was not shown. Which shows the fact that he might not be dead, Dazai may also know this fact, trusting him he'll make a right choice. In one of the episodes, it's clear Sigma wants to join the ADA. Who influenced him? Dazai. He wants Sigma to replace him in the ADA, another theory to show that Dazai may be leaving the ADA.
5. Mori asking Dazai to join the mafia again more than once.
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It is shown that Mori has taken a liking to Dazai and asked him to join the mafia twice when they met with the ADA, showing hw strongly he wants Dazai to join the mafia again. This is however a very weak evidence compared to the rest.
6. Dazai's sacrifices for the ADA
It is shown throughout the anime of Bungo Stray Dogs that Dazai has sacrificed himself more than once for the ADA. The recent one, getting arrested and faking a whole act to win against Fyodor. Although most would think that this is his amazing plan, he had sacrificed a lot for the ADA. It is admirable but it makes me can't help but wonder....If he did it once, twice an even thrice, what is stopping him from doing it again. Sacrificing himself for the ADA by joining the mafia is only a mere act of kindness to him.
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7. Oda's example and influence.
If Dazai does join the mafia. He can still maintain his good act just like Oda did, refraining from killing anyone in the mafia and helping others. This time, he'll take on subordinates and treat them well, teaching them well like he did with Atsushi. He will not exactly be breaking his promise with Oda.
This is however, a weak point and merely a 'what if' solution.
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