Tommo did say that, but if Helgeson isn't going to be available at the start of the season, I think they will probably want an extra spare from day 1, so will recruit 20 skaters. In the latter half of last year we had 22 skaters (including Harewood), which was when having healthy guys on the gantry was more of an issue.
Of last year's 15 forwards, 10 are still not yet confirmed either way: McDonald, Sanford, Yaremko, Kontos, Brandt, Davies, Perlini, Caponi, Ferguson and Lacroix.
With 6 forwards already announced, even if we start with13 (excluding Mosey) and Sacratini is the only newcomer, a minimum a 3 have to be leaving. Assuming there are more changes, 5 or 6 of those 10 are probably leaving and only 4 or 5 staying. Some of the 10 have been the subject of well-publicised rumours and speculation, but others haven't come up in the conversation much at all, yet.