If you feel that Gates will merely edge out Gonzo/Shockey by 4-5 FF pts, then Gates will instantly drop 20 rankings in your VBD.
This isn't entirely a trueism. If Gonzo/Shockey are projected to get closer to Gates vy increasing their projections, Gates would have the same value score and would still have the same ranking based on VBD. Only Shockey and Gonzo would rank right near him.
Remember, VBD is based on the lowest scoring starter at that position (TE 12 in a 12-team league). If Gates was projected at 150 points and #12 was projected at 75, Gates would get a value score of 75 no matter what Shockey or Tony G scored.If Gates' projections are lowered, that's where Gates' value score would take a hit. If you don't think Gates gets to 150 points, deduct the difference from his value score and he would fall some in the value rankings.