People knew he was a shoo-in for the final from Week 1, even if the public vote puts him in a dance-off. He has no journey story to help him, other than a metaphorical drive through Lincolnshire, flatline all the way ... he was good to start and he'll be good to finish. Others have arguably been in that position before, so they can't be the reasons why IMO he won't win the final.
Other possibilities ... His pro partner dances great but has all the emotional connection with the audience off the dance floor of a Westworld robot. Maybe he is having great fun but it doesn't look as though he is. He seems to provoke the kinda reaction you get from some people when one of those pro couples that everybody in ballroom dancing raves about make a guest appearance on the show ... I'm sure it was technically great and all that, but didn't make me wanna get up and dance with them or shout 'Gwaan, my son' at the telly. He winges too much about people not liking him because he's good. He needs results and fun, not just results. Keeps missing one part and he'll only be making up the numbers in the final.