You mention burning the adds down in less than 30 seconds. We kill them in less than 10 seconds. Tanking without focusing down would be a poor decision.
Finally, it is important to note that the amount of blood power that Saurfang gets is irrelevant. Because there are two important things to consider. First off, 99 blood power is the same as 0. The mark of the fallen champion is the important thing to watch and since it casts at 100 blood power no one cares about 99. Secondly, no one cares how fast Saurfang gets blood power, only how fast he gains blood power in relation to how fast his health is declining. By eliminating kiting we dropped from going the full 8 minutes to kill him to going only 5 - 6 minutes. Since we kill him at least 25% faster we can soak a 20% increase in the rate at which Mark of the Fallen Champion is applied and still have a net gain.