If Whites skill set is as advertised, I fully expect him to play alongside Freeman for 15 minutes per game (with a center) by January. (a somewhat poor man’s Melo/Warrick combo). Freeman at 35% from 3 would assure we see this. (and playing against bigger teams might dictate we see this).
A Freeman/White/Kyle front court would be as athletic a front court as we’ve had in 10 + years.
As you say, the rest of the time it would appear that we are likely to play more small ball, with three BIG guards. ( we did it lots last year with two small guards and Taylor at the three) . Would allow 25 mpg for JJ, Kingz, and the starting PG, with 30 more for Fennell, Anthony and Womack, based on how they are playing.
I think a 6 foot 10 power forward/center combo that weighs at least 230 is more critical than a backup true center. That way if White is not ready, Freeman will not be locked into playing just the four.