True to what Zephyr had said, Cade was indeed not helpless even when he could not fully exert his innate magic. With the help of the dragon blood flowing in his veins he could utilize 'Dragon' magic.
Dragon magic was not as powerful as the Draconic magic. To provide a clear distinction, the former was considered simplified magic while the latter was Ancient magic.
In any case, only a handful of the Regis could fully utilize the dragon blood in their veins. There were more who were given the opportunity to take a drop of a dragon's blood, but their body could not withstand more than 5% of its power.
Among the current generation, Cade was the only one who could utilize it to more than 50%. As a matter of fact, he was the only one in the Regis's family history.
Kyran was a different case. He was not using the drop of blood to utilize Draconic magic. He had a Draconic core and the dragon blood he took acted as a stimulant to activate it.