You don't need to DL 700lbs to fight anymore than a football player needs to bench 500lbs or bench 225 for 35 reps.
Maybe you don't
need it, but wouldn't the strength be advantageous?
Think of all the muscles involved in a deadlift and the strength involved in lifting 700lbs.......you really don't see how that could benefit someone in a cage fight?
Maybe you should get some stilts, so you can see past your ego.