I started a new thread on this as there was one related to the TPE (which expires in just hours) and one related to summer league players, so to keep it going, I started a fresh one.
My first point is to look back on the more frequently used line ups from last season. I categorized players as Combo, Wing, or Big. I know there are more guard'ish wings and more forward'ish wings, as well as more PF'ish bigs and more C'ish big, but bear with me.
The most used line up combination from last season, by far was:
Combo/Wing/Wing/Big/Big (for example Smart/Brown/Tatum/Horford/RWill)
Of the 14 top used line ups, this combination ranked 1, 2, 5, 7, 8, 9, 10, 13. This was clearly the most used combination.
The next most used was:
Combo/Combo/Wing/Big/Big (for example White, Smart, Tatum, Horford, Williams).
This combination held the 3, 4, 11, 12 used line ups. Quite a bit less than the top combination but still used pretty regularly.
There were two different 1 big line ups that appeared in the top 14:
Combo/Combo/Wing/Wing/Big (6th most used)
Combo/Wing/Wing/Wing/Big (14th most used)
As to the roster, I break it up as Starters, Core Rotation, Insurance, Prospects
Starters: Smart, Brown, Tatum, Horford, RWill
Core: Brogdon, Gallinari, White, Grant
Insurance: Pritchard
Prospects: Hauser, Kornet
In my mind, the Roster spots that could be filled are one more core player (a wing), 2 insurance players (Wing and Big) and then any others are prospects. In reality, it is unlikely that they add both a core wing and an insurance wing. A core wing of course likely costs more in contract and in assets if we acquire a core wing in a trade. Insurance slots I am assuming can be had for min or near min contracts.
Based on last season's wing usage, they like to keep 2 wings on the court a lot, even 3 wings sometimes. Brogdon may well end up being one 3rd wing or the core rotation bench wing. But if you want to match last season's line up use, we should have 2 wings available off the core bench rotation, Brogdon can clearly be the "guard'ish" wing but the gap is for that "forward'ish" wing (and no, Grant Williams is not that).