SEN-MAN is 3X daily.
If passenger numbers are in line with Stobart's expectations at this point, and they intend to play a long game then there's no problem. But we can be fairly certain that Manchester have not offered Stobart a stunning deal in the same way Groningen or Antwerp may have, so at some stage those rotations need to generate significant income just to break even.
Remember, when Stobart came along they saw the future as niche freight and regional passenger flights. They're now backing themselves to deliver the latter part of their own vision. I guess they'll give their choices every opportunity to come good.