It's tough to compare their respective stats since they play different positions and face different types of players. My only concern is the trend in the league to have centerless line-ups like the Warriors and the Rockets last season and add the Lakers to that this season; more and more teams appear to be playing stretch PF's at the 5 - in those cases, it would appear easier to simply start Ibaka at the 5. Despite the trends though, I think my preference is to have a starting 5 of Klow, DG, Kawhi, OG, JV and trust that the highly improved perimeter defense will allow JV to corral the rebounds and protect the rim without being exposed.
Of course, Danh is most likely correct in that the team will have a starting 5 of Klow, DG, KL, Ibaka, JV and then adjust the lines after the game starts.
Most teams still start a natural center and play bigs a lot of minutes at the 5. There are only a handful of teams that can play a stretch 4 at the 5 effectively (even in GS Green isn’t that much of a threat from distance). And if JV continues to evolve, then force teams to match up against the Raps instead of vice versa.
The Raps also have a better option in Siakam should teams go small.