...I would venture that it is related to your skills rather than the camera.I have very limited experience shooting sports so it's definitely my skills that I need to improve on. I've never had anyone to teach me to use a camera so I had to learn through trial and error.
...I also have limited free time, so I want the best gear possible, to make the most of the time that I have.It's awesome to be able to maximise your free time with your collection of equipment. I wish I'll be able to do that one day (perhaps in 2 or 3 years) but not in the near future. My priority is my studies for this coming year.
It appears that you like the Nikon D700, so why not just get a D700? If you're going to shoot sports/action, the D700 can shoot 8 fps with a battery grip, and the the 51 point auto-focus system is better than the 5D MarkII for action.My original post was made out of curiosity; I wasn't looking for purchase recommendations. Thanks for sharing those photos!