Yeah, I absolutely agree. With the whole thing on the novels, you can only really get snippets of his personality and minor character traits from there, and small details such as what he wore and liked to do. His arc in the novels doesn't line up with the games at all, which is intentional, but at the same time he never had a games arc since he wasn't the centre of attention until the day he died. I definitely agree with your statement, and even if Steel Wool doesn't take the GlamHenry route he should at least still be relevant post-FNAF6, especially since almost everyone else is theorised to not have truly died in the fire. If not, some sort of prequel, or maybe even (and this is more likely tbh) another book set in the games timeline like Tales From the Pizzaplex is, but instead of focusing on completely new characters we bring in older ones that need more delving into.