Compression is it my rings or my camshaft timing chain is fine no metal filings in the oil

Did cold crank compression test with my mechanic
receiving 90 95 90 on 3 cylinders receiving 116 PSI
on the 4th cylinder have not performed a wet test
yet pulled the timing cover timing chain looks
excellent timing marks line up trying to avoid a
total teardown started out with no spark changed
everything ECM ignition module coil packs crank
sensor cam sensor heater sensor even had the
ECM flashed found a broken power lead to ignition
module connector repaired now with spark to the
spark plugs but terrible compression I would say
I'm pulling my hair out but I'm bald so I'm kicking
myself in the ass instead 1700 haven't found the
problem