It doesn’t matter if he’s currently possessed by a Nogitsune, Melissa is still going to take care of her son.
What if Melissa's secret is that Claudia asked her to help her die, and Melissa did? And Papa McCall can't handle covering up her being a murderer so he leaves. Does that fit the timeframe?
omg omg it might fit the timeframe. also, didn’t holland say that stiles saying ‘thanks mom’ was foreshadowing? (i like to think it means that melissa is going to be stiles’ ‘new mom’ by getting together with papa stilinski tho) following your theory it could mean that claudia said ‘thanks melissa’ before she fell asleep and died????????????? oh gO d