The position player situation is more known. I hesitate to use the word "certain," but we have so many key players locked up for 3+ years, along with depth at several positions.
Bregman and Refsnyder are the only one year control guys, but I really think Bregman loves Boston and will return. He's the key, IMO.
1B is open, but to me, it's one of the easier positions to fill, and we still have Casas and maybe Campbell of some converted other position player to step in. Romy looks damn good, too. Yoshida is the next guy w 2 yrs, and that's better he's not 3+.
For once, we have the catcher position locked up. Mayer's health is the next big key, as it could finally solve our 2B issue (Mayer or Story at 2B.)
Duran 3 years and Story 2-3 years. Romy, Wong & Casas, too
Abreu 4 years! DHam, too
5 years Narvaez & Mayer
6 years Rafaela
8 years Campbell
9 Anthony
That's a solid 9-10 not counting Bregman or Ref, now Yoshida & Toro.
Arias, Garcia, Gonzales, Taylor & Soto look very promising. That's not the same as 20 pitchers, but the MLB core looks stronger and has longer control.
There is also Romero, Bleis, Cespedes, Azocar & Gadbout, plus more about to jump the rankings.
I'm very pleased.