So... I couldn't find Luke or Owen's heights, so I started this long post with math, trying to figure out everyone's height. (I finally found references in the bio cheat sheet.) Since they're all in reference to Sang's height... and the only reference to Sang's height is that Silas and North call her "tiny" and she is "Small enough that Victor thinks she's very young in his first scene with her" (per the bio cheat sheet).
So... any idea how tall Sang might actually be? If she really is tiny, that makes Victor and Gabriel pretty short, too. If she's more average, that could make Silas and North more freakishly tall than most of us think.
Yes, I know I'm totally over-thinking this. It's either that or re-read the series for the I-don't-know-how-many-th time.
Oh, and in case anyone wants the inside baseball math on the heights, I can copy/paste it.