Domas and JV together on the floor was definitely a bad combo in FIBA tournament. It was just really a no-go. Smaller court, no defensive three second stupid rule, no restrictions under FIBA rules on what kind of defense teams can play. It resulted in basically "wall on wall".
In the NBA though, we might see them on the court together. It could work in certain situation. Domas developed three point shot, JV can shoot too. Offense in NBA with both of them on the would not be a problem. Different thing is defense. JV is slow. Further he is from the rim - bigger problems for him. Anyway, Domas is fast and quick. If other three guys are fast too, well, just patrol the outskirts and let JV get the defensive rebound.
Splitting 48 minutes just between the two of them looks like the most proper way to go, but JV has a bit too much to offer on the offense to be relegated to only 12-15 minutes per game. And yes, Domas don't need to worry about them fouls too much. Kings back-up C is solid. JV was a starter in the league all his life until this season.