Ah, Batum. I forgot him. And Hartenstein as backup C.
G: J.Wall, R.Jackson
G: N.Batum, N.Powell, T.Mann
F: K.Leonard, L.Kennard
F: P.George, Marcus Morris, R.Covington
C: Zubac, Hartenstein
I will stay with my last guess that they will look to move one of Morris, Covington or Kennard. And that they'll keep Mann as a 3rd string backup to fill in whenever any of the SG, SF or PF players miss playing time which is probably quite often especially since they are counting on the injury-prone Kawhi Leonard.
So I agree, one man to many with one of the bigger wings or forwards on their way out.
I reckon Mann is the most likely to accept being out of the rotation given his youth. Kennard the 2nd most likely. I don't think any of the other older vets will accept not playing. They will be unhappy and cause problems.
That is why I believe Mann will the be guy left out - not because he is the worst of them but because he is the least established and the most likely to accept the demotion and be a fill-in as needed.