It could have been anyone other than Wolverine really. I like Wolverine, and I love Jackman's portrayal and find it neat he loves the character enough to keep playing him, but he has his own series of films now. There was no reason they had to make him the star of this film.
I'm too lazy to google box office mojo but as I recall FC disappointed at the box office, making less than TLS or Origins, despite being the best-reviewed X-film since the second, if not best ever (for my money, it's even better than X2). So, given that its also the film with the least screen time for Logan, the reasons for putting Wolverine centre stage would seem to be pretty evident, if that's correct.