I recall a interview (or statement) in which King basically said that Editorial (aka Didio) gave him 3 characters to work with in a Killer/Killed/Framed format, with those being Wally/Booster/HQ (leaving aside the many other random deaths and Roy's)
I would need to look up for the source in order to confirm that tbf, but if that was really the case, I would have so many questions regarding how idiotic this kind of editorial mandates can really be in DC..
I mean, with HiC as a prime example, what prevents DC for disgracing another character randomlly, even if it contradicts a year-long+ storyline and/or the current writers wishes..? smh