My African eland was a mature bull, and it was possibly the tastiest wild game I've ever eaten. We were able to stalk it and make the shot with the bull unaware we were present, so it wasn't alarmed or running, which I believe can be responsible for much of the gaminess in wild meat.
An example: My Dall sheep was dropped in its tracks with no fuss, and the meat was delicious. On the other hand, my Rocky Mnt ram was the result of a fubar event that involved several shots and an exhausting chase that was entirely my fault. Even the tenderloins from that ram were tough and gamey.
I would say that you should fry up the tenderloins from your eland right away. If they're tasty, then go ahead and keep most or all of the meat.
"For every complex problem there is an answer that is clear, simple.....and wrong." H. L. Mencken