For one, Elizabeth brings in magic, which is a huge factor.If that's what you're worried about, how much is grouping up going to change that? Going from three to five isn't going to prevent them from doing that, and given that it'll be all of them, organized, responding to one group instead of them disorganized and trying to respond to two situations at once, I'd think your plan would leave us the more likely to be surrounded.
For two, we won't be charging in and making it easier for them to do it, as you suggest.