oh wow, yea, I can see how the bulges can make all that confusing.
For the one on the left I think it's barely a few muscles up, but hard to tell.
For the one on the right, he clearly has a very buff erector spinae, and the erector does go all the way from bottom up, so I think what's happening there is that it's simply bulging under the Latissiums dorsi, even if it IS covered by the latissiums.
It goes something like this:
![](https://d1s0ws440m13mk.cloudfront.net/original/3X/2/e/2e3c078adb31f6203c75212bab4829a7af67426a.png)
Following the anatomy, this is what I think those muscles are positioned there:
![](https://d1s0ws440m13mk.cloudfront.net/original/3X/b/5/b59958bd6cc3867a29c5ca90ea1378393398b380.png)
I mean, that was rushed, but I think the idea is there.