Nicely explained..George...I also think that Lord Cutler,irrespective off the overwhelming odds he faced,realized that this battle could no longer be won by sheer force and their love(Will & Elizabeth)has simply overpowered the situation.So he deciedes 2 choose rationally than logically and gives in thus respecting his agreement with Jack and dying a changed man who respected the will-power of those he faced against.

Nicely explained..George...I also think that Lord Cutler, irrespective of the overwhelming odds he faced, realized that this battle could no longer be won by sheer force and their love  (Will and Elizabeth) has simply overpowered the situation. So he deciedes to choose rationally than logically and gives in thus respecting his agreement with Jack and dying a changed man who respected the will-power of those he faced against.