Lee Sin first clear: when tempo beats the gank
Every early gank costs clear time. Here is the arithmetic for deciding whether the gank is actually worth more than finishing the camp rotation.
A gank that produces no summoner spell and no kill still costs you the camp respawn timing and the level lead that decides the next skirmish. Ganking is not free just because it failed cheaply.
Only when the lane already has a reason to fight: a pushed wave, a spent escape, or a health lead your arrival converts. Arriving into a neutral lane with a full-health opponent is a coin flip you paid for.
Full clears into an objective contest put you at the pit first with a level lead. That is a repeatable advantage; a coin-flip gank is not.
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