The timing chain gets its oil from the front main bearing, plus on some MB engines, any oil from the oil pressure relief valve is deposited on the chain, I don't think it got much from there in your case. With low oil pressure, if the front main has excessive clearance, you would expect that the timing chain got plenty of oil.

With the cylinders in good shape it just doesn't sound like an engine that was abused in any way. But, if it was ever allowed to run low of oil the majority of such damage would be to bearing surfaces.

Keep on inspectin'.

Good luck,