I've been away for the last week or so and have only briefly read your posts, however, please do not rehome Oscar to a family who are not going to be able to cope with him, if they're having stand offs with him today, things are likely to deteriorate if they don't know what they are doing.
Without wishing to be harsh, it would also be irresponsible to rehome a dog with the issues that Oscar has to a family that have a child.
I've taken on 'difficult' dogs in the past, that's my choice and with that choice I accept that I may get bitten (and I have). There is no way that I would take on some of the dogs that I have if I had a child in the home.
You really do need to contact one of the cocker / spaniel rescues to see if one of them would be prepared to take him on and work with him. Oscar clearly is going to need a lot of help to work through his issues, rehoming him to anyone other than a very experienced person or rescue is likely to make things worse for him.
Like I said, I haven't had a chance to read through all your posts yet, so apologies if I'm repeating stuff that other folks have said.
I'll pm you with some rescues that you can try