Based on performance Judy, Jennifer and Scott were the least impressive (imo). I don't think Tim and Thom were great either, but think Thom deserves at least another week. I think Tim and Scott have a larger fan base than Judy, but have no idea how big Jennifer's own personal fan base will be as don't watch her show and, if it's not large, I don't think that her performance will inspire enough people that don't already know her to vote for her.
So, maybe Judy and Jennifer for the D.O.
As a random possibility for D.O. Pixie might get forgotten (voting wise) and presumed safe (due to her marks) and not saved. I would presume Frankie has a larger fan base to not get missed out by not just her fans but also those that don't know her well (prior to Strictly) that might still find themselves drawn to both her performances.