I generally base the werewolves habits to that of normal wolves and while normal wolves are nocturnal animals they can and are active during day time especially when there's something happening like when one them is sick or pregnant or when they're migrating to new territories.
And yes because we know so little about people in Northcrest I expect a backstabbing at every moment we're interacting with them.
Also while the Rat king's position is an empty one it somehow feels like a tradition that has been around for so long it lost meaning, so I think that originally the Rat king title held some importance and meaning to ratkin society but that was lost with time and ended up becoming this empty title that goes to the biggest ratkin around because they're the "strongest" tho the Rat king is obviously not that strong and he's just as weak to shows of strength as any other ratkin because of their natural inclination to being cowards.
Also I have this weird theory that scrap is the Rat king's unwanted son and he's different due to his genes, though because Scrap was born small the other rats just don't respect him, I don't really think Scrap has albinism he's just a white ratkin dwarfism or some kind of bad formation are more likely to be the reason why the others treat him like that, since it was mentioned he is human sized in height when all others of his species are taller than humans that is kind of weird. Alternatively he could be different because he's half human... actually how do ratkin reproduce they're all males no? Can they get each other pregnant? Do they impregnate other species, and the child is always a ratkin? Are there female ratkin and we somehow never encountered them before? Damn time to add that to the pile of unanswered questions...