SS is much more dependent on his board then Thor is upon his hammer,
Surfer basically just needs his board to fly (though his bios state he can fly w/o it).
Thor needs his hammer to do just about anything involving energy, including absorbing SS's power cosmic. Thor is much more dependent.
But i dont really know what is the Sonic shark..
In FF#72, when SS was newly imprisoned on Earth, he thought he could unite humanity by providing a common foe and goes on a global rampage. Torch and Thing try to stop him but fail utterly. So the military launches a cosmic-energy draining missile (designed by Reed, I believe, and really PIS if ever there was one), which absorbs all but a fraction of SS's power.
BTW, that scan (which I think is from SS#2) is the first time, I believe, that SS's power is referred to as the now-familiar "power cosmic"...prior it had always been called simply cosmic power).