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At idle it can take engines quite a while to come up to temp. This isn't ideal. It can also be caused by bad thermostats. Since the water in the oil isn't back it's probably ingestion through the intake or exhaust.

You can pull the rockers and reinstall without needing to adjust the valves. They'll go right back to the same position. I wouldn't bother retorquing the heads. If it leaked coolant into a cylinder, it's fried. But it probably isn't coolant you found. The water in the injection pump is...

Yes, on most diesel engines the injector lines can be removed as an assembly or assemblies. Even when servicing a single injector I'll remove all of the lines because it's so much easier than messing with those clamps.

If it's not the same color as the coolant it's not coolant. Is your coolant faintly yellow or a brighter color? It's quite possible for water to come in through the exhaust but it has to pass through a cylinder. It will have done some damage if it sat this long after passing water. Does the...