"Serious Talks" may just mean that the C's have put an offer on the table (undoubtedly well in the C's favor) that the Sixers are considering countering. Before Colangelo puts a #3 and a future probable top 5 pick on the table he needs to see Fultz. You don't offer that price without checking Fultz out thoroughly. But the C's then have the opportunity to counter again or walk away if the Sixers don't offer enough.
This is playing out as good as it possibly can. Had the C's got the #2 or #3, we'd be talking about who we'd trade to get to #1, or, we'd be talking about packaging 2018 Nets pick. We are in position to either get the best player in the draft -- if Danny thinks Fultz is the best, or, trade for someone Ainge thinks is just as good as Fultz PLUS other assets. AND, the assets gained may be enough to trade for a star without losing Nets '18.
I rarely say this, but.... it's all good.