holy shield and consecration do holy damage, and it's your holy damage that keeps the mobs on you, i've never tried to use rank 1 anything, i just pop the wisdom judgement on the mobs if i start getting low on mana...but the more holy damage you do to a mob the more he's going to stay on you...regular melee damage dosen't do anything for a pally...

i've had times where i would tank 3 mobs and after we down the first i would forget to make the pally swing and he would still hold aggro due to the consecration build up just standing there lol