I don't think it's unfair that he's probably the strongest conteder of the lot. It's not his fault he is better at the dancing than the others. Even if he's had previous experience. I'm sure when he signed up for it he didn't know who he would be up against and whether they would have the ability to challenge him.
I also wouldn't say it's a one horse race. Usually, a one horse race is justified by a firm backing of supporters - something I get the feeling Ricky is lacking in comparison to others. He may be getting through each week so far, but without the voting figures, we have no idea what position he's finishing. Look at how unpopular he is on here and a few other forums. Having the dancing ability usually isn't enough if you haven't got the personality the public want t go with it. Like Rachel last series. Technically great, but not overly liked by the public.
I have a feeling one of the weaker dancers, but with a stronger personality, could creep up on Ricky at the last minute and trip him up. Kind of like Austin last series. Wasn't he a favourite until the quarter final week?