Q skill is a main output mode in AP, because Kennan is a blue-free AP, so he can put Q without scruple. Just pay attention to his CD. W skill is used as output supplement, and E skill is used for hunting and escape. Big moves are the focus of output. Because in the case of AP, Kennan's output mode is relatively simple, Q skills are used the most, and WE skills can hardly be consumed. R skills can kill people. So the style of play is single.
Take AD as an example, relying on ordinary attacks as the main form of attack, and it is not very dependent on skills, especially for Q skills, which are just a skill marked by thunder. W is also born to release the lightning seal, and E skill makes it a shift ADC. The last big move is control.
Summary: AD Kenan abandoned the weakness of Kenan's single consumption mode. But it depends on the needs of the team. Kennan's big move would be much weaker if it was AD.