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"Broken/weak valve springs occur considerably more with age as the metal becomes fatigued" I would argue against this because springs are an item that get reused during a cylinder head reconditioning. If that is the case, fatigue is not a factor in their life expectancy. If a spring did fail...

There is a word for that when parts from one cylinder trash another. It's called communication. It would be unusual for an engine with any significant runtime to drop valve due to a faulty keeper or valve spring. Those are both infant mortalities. Recession leads to valve drops on higher hour...

I would plan on pulling the pan. The piston and liner will certainly require replacement. In the past I have bought piston, liner, connecting rods loaded together in a pack that you just drop in. If you only have to do one cylinder the cost isn't so bad. If reman is available that's even better...