Even if we'd have won by two or three clear goals...
Leicester beating us by one goal is much more realistic than by three lets say
3+ goals would have done it. Lets do basic math. Any goal for Leicester vs. us is +1 GD and -1 GD for us, which is a 2 goal swing. If we had won by 2 goals today, we would be +30 GD and LC +28. If Leicester wins by 1 goal, it would be tied on GD and Leicester gets into top 4.