Yeah. Once you are only wounding on 4s and 5s, you'd expect to do less damage by rerolling the successful 4s and 5s.
For example, 5 Possessed into Terminators with the undivided reroll to wounds.
For simplicity, 20 hits. (20*5/6*7/6=19.44~)
Notionally - 3.3 mortals
Reroll 16.66 = 2.77 mortals. So 6.11 mortals.
And 16.66/3=5.533 regular wounds. Terminators have a 4++ and the damage is 2.
So 12.22 mortal wounds and 5.533 regular damage. (The dice could never produce this result, but as an average). Total 17.777.
If you don't reroll successful non 6s.
3.3 mortals and 6.6 regular wounds.
Reroll 10 failures, so 5 mortal wounds and 10 regular wounds.
So 10 mortal wounds and 10 regular wounds. Total 20. Which is better.
It breaks even on a target where you were wounding on 3s, but they still had a 3+ save (and gets better if you are wounding on 2s, but they have a 2+ save) - but that seems like an unusual scenario.
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