If the VS separated when the tail was submerged, especially the closer the wreckage got to the bottom, I suspect to some degree it would glide to the surface. Depending on which area has the most buoyancy it might make a series of gliding loops, or swirl like Sycamore seed. In most pictures the rudder was also positioned to the starboard side, if firmly enough in that position it would also affect the ascent.
My guess would be that the deeper the VS separated the more likely it is to be found farther from the impact site. Even if it were to rise perfectly vertical the subsurface currents would have a longer time to act upon it.
A piece of wreckage like a cabin section might tumble upon ascent, but seems less likely to glide or sail than something aerodynamic.
Once upon the surface it will all depend on wind and currents, and whether there is more submerged or exposed area to be acted upon by each. Wreckage with a similar profile might stay together, but again over time one would expect those items more driven by wind or currents to separate.