It doesn't actually work like that though does it? For example in the late 80s the game was faster than the early to mid 80s, but the standard of the game dropped.
And you are also assuming pace and fitness are the only factors, which they aren't.
Put Ross Barkley in the 85-87 squad and he'd still continuously make the wrong decisions about when to pass and when to hold on to the ball.
Put Felliani in there and his lack of positional discipline and the fact that he only played at his best every other game would mean he would lose his place to Reid or Bracewell.
Put Walcott in there and his crosses would still be inaccurate and he would still lack the confidence to run at defenders...... and even being fitter than Trevor Steven he just wouldn't be able to keep him out of the side. Absolutely no way.