Brooke Parker is a current elite who has made it to nationals and she didn't begin competitive gymnastics until age 11.
While I actually agree with the basic sentiment that in the US system you don't need to choose an "elite track" anywhere NEAR as young as 5 or 6, this isn't really accurate, and like most high level gymnasts (9s and 10s), she started young. I can remember Brooke at 10/11 at L8 regionals. She did not move to an elite gym until that age, granted, but she was doing gymnastics at a much smaller gym until then and had progressed through the levels. She is an example of what I would say is not an unusual path for US high level gymnasts: she did gymnastics, learned good basics, hit ages 10-12 and was able to make huge gains in progress when they decided to choose that path. But I'm almost positive she didn't start at 11. She's very talented and that path is not necessarily unusual where she grew up, very few gyms really have had the TOPs/elite track programs (even those that produce good L10s) and the more usual path is the kid does gymnastics until about that age, they decide to try for more and move to Capital or Hills. I can think of a couple examples offhand of that.