6 Dorans rengar troll or legit?
Rengar plays top occasionally. Hes not a bad laner because of the bushes and dueling power he has. Ive seen rengars start
and
.
If he gets first blood, alright he might buy another
.
Natural gold over time and CS will grant him one more
.
Now he has three Dorans Blade which gives his a lot of stats.
One more kill on top of CS and that is two more

now his build will look something like this

Or Just 6 Dorans Blades
Can someone explain this to me? I know it is a Lot of HP and Life steal but is this a legit tactic or just cheesy?
After his inventory is maxed out with dorans blades he can buy
or
And will still have a few Dorans on the side for the stats they give. Why does this work so well?