I would normally agree to this. But the ISO is so much better on the 5diii, that you can work with the f4 and get even better results than a 7d and f2.8. Then later on maybe get a 70-200mm f4l if you need more than 105mm.
What is it that you think you are agreeing or disagreeing with? The simple fact is that you can buy a 7D, a 24-70 and a 70-200 for $150 less than the cost of the 5DmkIII kit that includes the 24-105.
Which one of those options a person chooses is up to them but the OP, as an example, lists field sports in their list of uses and 105mm on a full frame camera is simply not going to handle field sports. Even 200mm is often short on a FF so they would be looking at something like a 300/4 or a 100-400 and now the price for the kit is in the neighborhood of $6000. if they are willing and able to pay that much for a kit then they will have a very nice kit. But if they can't afford that much then there are other options that are much less expensive.



