Recovering a solid from a lion could be explained in a few ways but the most logical is that it deflected before impact and struck sideways or some way other than point first. There's typically a logical explanation. I've seen many pictures of unexpanded TSX and TTSX recovered from animals and many of them without petals and insert any bullet name before "bullet failure" in Google and you'll get pages of results. I suspect most have a logical explanation but most just want to instantly blame the bullet despite it having a long and proven track record.
I've seen the unexpanded TTSX/TSX pics too. It's one reason I shy away from them. However I've only seen this in the small/medium bores, not the big bores that are used for DG. Perhaps there are reports of the same in the bigger bullets, please provide a link if you have any. I've mentioned this problem on a number of occasions on AH. The difference is that I find far more bad reports on the DGX/DGS than I do on the Barnes products.
I used a TSX on my African trip. Hit a small twig about a foot in front of my barrel when shooting at an impala. This caused the bullet to deflect a bit and hit a much larger branch of a fallen tree. Took out about an inch of the branch. The bullet continued on and hit the ram, and it appeared the bullet was now spinning on the vertical axis, not just the horizontal axis as the onside hole was just bit wider than the length of the bullet. The bullet continued thru the impala and exited out the other side.
Perhaps that solid of Erik's did deflect a bit off a twig , but it should have easily passed thru the lion. I would say the most logical explanation falls in line with the many reports I've read about the DGS. They're straight line penetration is pretty poor.
Do some looking around specifically at the North Fork and Cutting Edge Bullets solids. Their shape and profile are quite similar. They both have a flat meplat and the shoulder angle is the same. They were specifically designed this way using lab results to maximize penetration as well as maintaining a straight line.
As I understand it, the North Fork Cup Solid, the expanding solid if you will, came out of a request for a solid which actually wouldn't penetrate as far as the regular solid.
In other words, yes I do believe there are better choices than the DGS.
Also if you didn't read the recent elephant hunt thread by mrpoindexter, you might want to. Elephants manage to get into some of thickest bush. A solid in this situation had better not be too sensitive to twigs or small branches.