^ Take his advice and run 21/9/0 masteries, build elder lizard + sightstone and go tanky afterwards.

You completely defeat the purpose of picking Lee Sin in the first place. Going tanky and speccing the majority of your points into the utility page make you really weak in the early game and he already falls off in the late-game anyway. If you want a snowball advantage, the best way to make sure people die is clearly by speccing damage.

There's not a single high-tier player who picks Spirit of the Ancient Golem now. Literally NONE.

Also, Trinity Force as core? Not even close.