Now there's a really good question!
IMHO they're going to re-sign (not to be confused with resign) two of those B's and my best guess is that two of them will be outfielders and one will be named Benintendi. The second one will be Mookie unless his demands are sky-high, and then the second one will be JBJ - who should go cheaper.
Ya, I know that good hitting SS's are hard to find but this one is going to command - and get - a whopping load of money. Enough money so that if they sign him he could be the only one of the four to get signed, and I don't see them letting 2/3 of their OF get away.
I hope I'm wrong about that and we can re-sign 3 or (pipe dream) all four. But that's JMO and we're a few years away from that yet. Anything can happen in that time.
And I know.. my math doesn't always work out, but I still think XBo is a goner. :-(