A Bearcat/Hornet formation is a lot better performance match than a Tomcat/Hawkeye formation, but dissimilar formation is often more exciting than desirable. One of the worst formation near-disasters to which I was ever a party was an attempted formation interval takeoff with an A-7E leading an RF-4C. The Corsair pilot leading briefed a 5 second interval, and we still caught him halfway down the runway with our gear still in transition. I think we made three inadvertent lead changes before we passed the departure end -- we went max to idle to mil to max and back a couple of times before things stabilized with him leading and us on the wing.