It is. Do a web search on "Joe Eigo" or "multi level moves" for similar....
On a more serious note. How can you relate that in anyway to aikido ukemi?
The development of physical attributes: coordination, strength, power, flexibility, balance, toughness, etc.... Does aikido change with someone that athletic?
On the other hand, there clearly is a law of diminishing returns if someone's goal is aikido. At some point, the time spent learning a backflip is time that cannot be spent working on ikkyo...and the skill development in learning the backflip doesn't transfer to aikido.