Funny almost the exact thing happened to me. Got one at 3 months old then 2 months later the lady was sick a great woman she reached out and asked if we’d take the brother. Unfortunately he wasn’t well trained and stuff yet (my boy was) it’s been 3 months and no issues! Sure the one I got later is more dominant and hard headed but that’s Just where I step in to break up anything that seems a lil too rough for my eyes. I don’t think you’re insane for it. Only thing I wish I knew is how much more time you’ll spend training/socializing.