The turbo can sit as long as you'd like and the seals won't go bad, the seals are metal, like piston rings.
You didn't mention in your initial post about the water ingestion, which I suspect is the root of your problem and I'd suggest a rebuilt.
You mention the shaft has play, is it in/out play, or up/down? A bit of up/down play is normal, but in/out play there should be none.
I've never heard of a screen or restrictor built into a turbo, I doubt this turbo has one.
Your drain looks good, not likely the culprit.
You didn't mention in your initial post about the water ingestion, which I suspect is the root of your problem and I'd suggest a rebuilt.
You mention the shaft has play, is it in/out play, or up/down? A bit of up/down play is normal, but in/out play there should be none.
I've never heard of a screen or restrictor built into a turbo, I doubt this turbo has one.
Your drain looks good, not likely the culprit.
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