I would suggest you meet with each other first, then present your case to the Executive Committee and act together at all times – apart from anything rlse a united force poses a much more serious threat and you can agree to share legal costs, if it comes to that.
That said, if you do seek legal advice, make sure it’s from an experienced strata lawyer – not just some solicitor relative of one of your number. Most non-specialist solicitors don’t know very much at all about strata law.