Regarding the second part of the statement... Take Kim Jong Un. He holds considerable power, yet he is probably not particularly physically strong. Of course,

Regarding the second part of the statement... Take Kim Jong Un. He holds considerable power, yet he is probably not particularly physically strong. Of course, he could use a firearm, but even then, he would be fairly easy to stop. However, he has body guard. Besides loyalty, a good reason for these body guards to obey his orders is that otherwise they will be arrested and executed. The people carrying out the arrest will also act on the same incentives. In the end, there is nothing intrinsically powerful about Kim, there just happens to be a complex meta-stable equilibrium of incentives which gives him considerable power.