In game 6, Wade was 6 of 17 and 5-5 at the line for 17 points, with 8 boards, 4 assists, 3 steals, and 3 turnovers in a game Miami won by 19 points. Bradley would have had absolutely no effect on that game at all.
Game 2 would have been the only game where Bradley might have mattered, but the simple truth is once Bosh was back that series was over and if Bosh was there the whole series it would have been Miami in a walk with or without Bradley.