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Your PUMP 1 question about the hole. Well that is a weep hole. The coolant comes out here if the mechanical seal is leaking. The mechanical seal is used to seal the rotating shaft to the pump housing. The weep hole releaves the coolant pressure so the bearing doesn't fill up with water. A leak here also lets you know the seal is leaking.
Your pump 2 question about the marks. If it was a rub the marks would be shiney. I think that is just some rust and looks similar to the marks I have seen. Do the marks wipe off?
No sealant is needed on the Z rubber washer. It is just a seal to keep the water and dirt out of the T-belt chamber.
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