I like the idea of Max Shreck being expanded upon in this "Resurrections" book, as I think the author can really build upon what we saw out of Max in BR. We get the idea that Bruce and Max were acquainted with one another in BR, and we understand that the business relationship is contentious to say the least, but what led up to that? If, evidently, the aftermath of the Joker's smylex attack on Gotham City is going to be more elaborated upon (and this can go into some incredibly dark places if the author chooses so), I can easily see Max, being the opportunist that he is, swooping in with PR stunts to curry favor with the Gothamites for his own gain. Max was presented as nearly 'untouchable' in BR as far as lawfare goes, but what transpired between B89 and BR for Max to get to that level?
Going back to the aftermath of the Joker's attack on Gotham, I can't help but think of 1954's "Gojira", where following Godzilla's attack on Japan, we see images of people who survived the attack itself, but are now dying of radiation poisoning. With children crying and distraught over their parents slowly dying in front of them, ect. You just know the Joker's "Gotham Shopping Nightmare" had equally horrific outcomes. You made it thru? Great! Now how about every member of your family who lives in Gotham? Your friends? Co-workers? How many famous Gotham socialites perished? I can't imagine it was just models Candy Walker and Amanda Keeler whom unknowingly poisoned themselves with Joker's brand...