Well considering Cho was using the ability to sense energy already it makes no sense to suddenly revoke it.<br/><br/>Basically a native earthling, with ki sensing can sense energy as a racial attribute. And I'll reduce the power requirements to 250. After all Goku could sense it at the very start of DBZ.<br/><br/>You can do this naturally unless there is a margin of difficulty. Such as trying to pinpoint a power when you have several around you of variable strength. Or when someone is suppressing their energy which is a contested roll.