ahh sorry about that, I meant didn't survive well. And I should mention that the sun here(SouthUSA) is intense and hot(95F-115F).
Both had to go outside one day while my power was out. And to that effect the indica looked horrible when I brought it back in while the sativa was standing straight and just generally looking healthy.
At first I thought it was all from heat stress. So acting as a true scientist, I set forth to prove myself wrong. I put both of them in a window that receives great light and found that the indica still looked pretty stressed after one day.
I imagine that after a week or so they would have adjusted to the light.

And I had no clue that sativa's were supposed to be more airy. But now that you say it...
I was under the impression that the only limiting factor in density was light(not penetrating enough).