It is a valid point that, when we talk about the 4 top shortstops, we begin to think of them as equal and interchangeable. But that is far from the case. A quick look at the stats shows that Swanson isn't in the same class as the other three, and isn't really much of an improvement over Hoerner at shortstop. Swanson isn't the "star" player that so many people on this board seem to think that is essential to victory.
Granted, all things being equal, a shortstop has a substantial premium merely because of his position. When it is determined that a shortstop prospect will be unable to continue at shortstop, his value drops substantially, because a better than average hitting shortstop becomes an average hitting second baseman, or a below average hitting third baseman. And yet not a single person has really mentioned that when we move Hoerner to second base, he loses value merely because the hitting requirements of the position are much higher. While it is true that a great shortstop can probably play most other positions on the field, when he does so, he loses value to the team.
Like BlueJay, I will be quite disappointed if the Cubs sign Swanson to a contract that is anywhere near the price or length of Correa or Turner. I would much rather leave Hoerner at short, and put the money into a top pitcher or third baseman. Bogaerts is slightly different than the other three, since a great many people believe that a move to third base will happen sooner rather than later, and that will probably enter into his contract price.