I don't think anyone can give you a meaningful answer. Anyone who DID use an adviser doesn't know what would have happened to their case if they DIDN'T, and vice versa.
Anyway, no adviser or immigration lawyer has any "pull" with INZ, so clients' cases don't get any special priority. Anyone (with adviser or not) will only get contacted by the CO if there is evidence or information missing from their application - that is the trigger for the CO requiring more input from you, not the name of an LIA on the paperwork. A private individual can get all the details of what is required from INZ's website and forms if they are careful. LIAs tell you the same things the paperwork and website tells you, and you still have to assemble all the documents yourself. You have got an equal chance with everyone else of absorbing the new regulations - they are there for us all (LIAs, you, me) to see from just these last few days. LIAs haven't had any preview.