Those who have commented on Antons latin ability are absolutely correct. He is really bad at all the latin dances, and if he had a really able dancer, would be the one holding them back as a couple. As he cannot dance them properly himself, he has no chance of teaching a celeb.
Also, as already said, how do you know who is good in advance? If we are looking at older partners, Darren and Vincent have had much older ladies like Anton, but Ian, James, Matt and Brendan haven't so perhaps I could see an argument for one of those dancers having the "older lady" rather than Anton. But other than that, I think it is "pot luck" whether they turn out to have any dance ability.