318 TDC help

So i confirmed compression stroke on #1, hand cranked until the indented line going halfway across the dampener was in the sight hole ( was closest to this half line both times), rotor button both times was pointing at the positive post on the coil. I realize that just being in that sight hole isnt perfect tdc but im wondering if it hasnt jumped a tooth on the chain? Also for the first time since its been dead I can hear air exiting the exhaust when cranking, and no longer hear the metal-ish noise (what i had assumed to be either starter tooth/ flywheel noise or timing chain noise). Maybe its just a weird coincidence or something but I found it kind of odd lol