It could also be from the David who was assumed dead but is secretly still alive.
I don't understand the complaint that the book wasn't about investigation. There were ten issues, in those ten there have been three story arcs dealing with three different investigations: Aurora, Sofia, and Terry. In the XoS tie in there was a story about how a specific kind of death affected resurrection. And in the Hellfire Gala issue we will likely get a tease for the death in the Trial mini.
Baldeon's art is very stylized, when that is the case people generally either love it or hate it. I grew to really appreciate his work, his panel and page compositions, especially in the last five issues, has been amazing, and he was one of the only artists to put effort in creating a unique design aesthetic with the team uniforms and the design of the Boneyard.