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Big sad.Damn.
Well I was more so thinking about the valves hitting the piston, which would account for the low compression #'s (assuming cylinders 2-4 pistons kissed the valves) a little borescope camera could confirm if they made contact.
Valve lash has to do with valve overlap and timing. If the the lash is too tight, it would cause the valve to open sooner, open wider and stay open longer . That could 100% cause low compression and potentially burn exhaust valves and get compression loss due to the valve not seating quick enough on the compression stroke.
But, to get so many wrong that 3 cylinders are basically dead... Hard to say, but at this point I wouldn't bet against that possibility.