Ok. Let's consider Minny's position. If they trade KG, they are shaking it up, which means that they would be looking for:
1. Young promising players. We have 2 of those. Barbosa and Diaw. Amare would be in that category, but he is not on the table. They would also be interested in Banks (who played well for them) and James Jones.
2. Multi-players. They are not going to get anyone that will help them in a one for one swap for KG. They have to get multiple players and build a younger core. While Marion would be nice, he is not enough.
3. Picks. They don't need them all this year. I would think that they would be looking for at least 3 first rounders over the next three years or so. Its tough to incorporate too many rookies in a given year. Its better to a 1 or 2 each year.
4. Cap space. KG eats up a lot of Minny $ each year. They could take that money and purchase a few really good role players that would make a difference in their team. This is where they would likely get vets. They would want players like Raja who are good lockerroom guys and emotional leaders on the floor.
So, who might Minny be interested in, in a deal for KG: LB, Diaw, KT (for cap relief later), Raja (decent contract, helpful vet), James Jones (quality role player on a decent deal), Marion (quality player and with the cap #'s to make the deal happen, although he would not be their primary target) and loads of picks.
Its silly to criticize trade proposals here with things like "minny's #1 player for our #4" because there are so many other factors that matter more--like picks and cap space.
If Minny wants just one great player, they need to keep KG, otherwise it will be a package of "lesser values" that will allow them to build for the future.