Dr McNinja III: You Rad Bro?

[Radar]

I don't think it's quite that simple. Someone who's a natural ninja and hepped up on ninja steroids is probably going to have to do the most ninjalike things he possibly can. Since a ninjalike operation was all set up and ready to go, when he went on his ninja bender, he did the most ninjalike thing possible (that mission) in the most ninjalike way possible.

This was the point where it became obvious to me that His Majesty at least suspects that Looch is Doc

There is another possibility: he might have secretly sabotaged the wooden planks somehow, so it only seems that he did the assignment.