Yes, it's kind of interesting that solids are used on dangerous game to break bone and stop them and yet apparently on a less challenging animal, if you shoot it with a solid, it will get away. Actually, this is the way it is:
1. A solid is can be used for two reasons. One would be for penetration. In the case of the Elephant with a huge amount of tissue to penetrate, it's entirely possible that that an expanding bullet wouldn't make it to a vital organ to kill the animal. A solid may also be used to minimize meat or hide damage.
2. It is true that shot placement must be more precise with a solid. A solid wouldn't be the best choice if you're the kind of shooter satisfied with "minute of deer" or "all shots in an 8 inch pie plate at 100 yards."
3. An arrow doesn't expand and neither does an all lead bullet. It's pretty ludicrous to maintain that FMJ bullets are bad while at the same time trying to justify the use of arrows and solid nonexpanding lead projectiles.
4. And, by the way, I'm not on the solids/FMJs for everything band wagon. There is no doubt that a .224 caliber bullet that expands to .350 inches is going to produce more shock and produce a bigger wound channel and cause death sooner providing you hit the animal in the lung than a nonexpanding .224 caliber projectile. For head shots either type of bullet will work equally well. If you place shots with precision an FMJ/solid should work well for you but if your talents or equipment don't allow such precision, you're better off with an expanding bullet.
A Black Back Jackal taken in South Africa with a 375 H&H Magnum using a Hornady 300 gr. FMJ bullet. Using an expanding bullets would have resulted in a rather large unsightly hole.
An African Wildcat takin with an FMJ bullet out of a 375 H&H Magnum.
The guy that shot this Steenbok with a 340 Weatherby Magnum had his heart in the right place. He read the words "solid copper" on the box of Barnes XLC bullets and thought they were solids. They are solid copper but certainly expand well. The Steenbok is the about the size of a large dog.