7 inches is plenty of penetration, but looks high and forward, may have got the top of the lungs but close to being to far forward, not much there between the neck and rib cage but muscle , hard to say weather it made it our not but have seen them hit in that general area live. I had 1 years ago I hit there in early bow season , looked for hours, wound up killing him 1/4 mile from where I shot him in late December, still had the head and piece of arrow in him. They are tough for sure. Always tough to loose one but it happens.
Pappy