what if the Alpha was the reason Logan knew about the pack being in trouble? like when he was near Bareshade he did something that alerted Logan about the packs distress and how he needed to help?
now everything else is quite literally almost exactly how I feel so I won't comment on that, but the rat king being a fake king sounds interesting, like what if the previous rat king was a scavenger and built things but ended up being dethroned by the current one because he was able to awaken an old trait of the rat people? (The sexual insatiability) and he caused him to go insane with lust? and Scrap being resistant could be a sign of evolution in the kind and us causing him to regress could be us doing what the current king did and now need to help him overthrow the current one if we keep him on the sexual path? or let the current one stay and have Scrap integrate into society? maybe we could even start a whole new people with Scrap as the leader!