I think the point we're trying to make is that, generally speaking, patients in cardiac arrest are not transported by air. The standard is to work a patient on scene and either transport them when vitals are regained, or pronounce them where they fell. Transporting people in cardiac arrest is not done as a valid medical protocol, it's done to keep the crews from being assaulted by angry family members.
So, it doesn't really matter if someone already had a Lucas device in place by local crews, because 1) They're probably not going to let you leave with their expensive toy, it's coming off and staying with the ambulance, and 2) a person in cardiac arrest isn't being rushed to an air unit to begin with, regardless if it can fit a lucas. Especially double-doggy-super-secret-extra-probation-so if you're at an MCI and are triaging care: arrests from penetrating trauma have an exceptionally low survival rate, and using any modern triage algorithm during an MCI are black-tagged and treated the same as dead.
And so, asking, "What, can your air units not fit a lucas?" isn't very relevant because it isn't contextually valid to the majority of current day practices.
But, going back to one of the points in the article about EMS crews being brought patients they couldn't help....the biggest gain by employing a robust Rescue Task Force is the ability of embedded EMS to triage. Anyone can apply bandages and TQs, but the ability to triage properly can make a huge difference on outcomes.