Yet before all that, before he faced the masters before he really drained the power from Kreia because thats all what he did ot learn, he was considered a mediocere Jedi, an average student with a gift.
Thats it, the Exile is not skilled and when he had barely started hearing the force again, as nothing more then a whisper coming from far away he was already good enough to beat one of those doirds. I don't care how he did it, but HK would not have fallen for such a thing, especially not if he had the element of surprise.