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I personally don't even consider Mangini, Tui, or Liddi to be prospects. I don't think any of those guys bring the neccessary bat/glove profile to be everyday major league performers. As for Triunfel, I still believe he'll hit for power down the road. He has the god given ability to square up a baseball and above average bat speed. I still want to see what happens with him if they tweak his swing a bit to get more loft, and what will happen when he physically matures more.
That being said, I certainly feel the odds are well below 50% that any of these four players ever plays 3B long term for the Mariners.