Because when its Corsair or Outcast, it always does!
Titan sized as a Centurion isnt really a step up or down in size. If you look at the size of the Centurion and the Titan, the only difference is a slight bulking of the wings and an addition of a winglet fin on the end of each wing.
But honestly, the stats aren't going to be decided here. Whatever it happens to be, im sure it wont be anything as ridiculous as a Catamaran, Liberator or BHG gunship.