If Segura walks, they have about $30+M (Segura, Didi, Herrera - $35M) for position players with only SS to fill.
As far as pitching, Gibson ($10M), Thor ($22M), Knebel ($10M), Eflin ($10M?), Hand ($5M), Robertson ($9M), Famila ($5M) -
they'll need 2 SPs and 1-2 RPs, but unless they're looking to add a $20+M starter, they should have plenty of head room to fill those holes.
So they could add one starter in the field, 2 back of the rotation SPs and 2 7-8th inning RPs for say $65M, which would still leave them well below the "salary cap," given they'll clear close to a $100M.
Now my calculation is very crude, just getting a sense of what they could do.