The long Boston Globe article from earlier this week says that JA and RB spent 24 hours together before she told him the news of Bella. Yada yada yada about spending the night next to the water, needing to spend time together as a family.
From a more recent article: "Police knocked on Quinn and Drakes door last Thursday night looking for Amoroso, said Drake.
He said Amoroso and Rachelle Bond arrived at the apartment an hour later. Drake asked about Bella and he said Rachelle Bond told him the toddler was at her godmothers. Pressed about the girls whereabouts, Quinn said Amoroso and Bond kept saying, its not good.
Amoroso, interviewed Monday in his mothers apartment, said Bond revealed his daughters fate to him last Thursday afternoon, hours before he went with her to Lynn.
My heart was ripped out thread by thread, he said."
So it appears that JA and RB hooked up on Wednesday afternoon, not too long after she spilled the beans to Sprinsky.
Coincidence?
Police showed up at JA's mother's apartment on Thursday night before RB and JA got there, so RB had to know it was just a matter of time before the case broke. Both RB and JA were detained for questioning on Friday morning. At that time, JA was most likely considered a possible suspect.