My guess is that it wouldn't hurt! Say you put in a 3:00 finish and can give proof that you will finish in that time... vs someone who puts in 3:00 finish with no proof.
If *I* was the person assigning corrals
I'd put you in a higher corral if we needed to split you two up, because I have "proof" that you are running that fast and none for the other person. Does that make sense?
Typically there are 2500 in each corral. Say there are 5000 Princesses who put 3 hr finish (could happen!) Disney needs to put them into 2 corrals. but they all have the same time- so how do they decide?
Totally my thinking- I have no proof!- but I'd think they would look at proof vs no proof, or possibly when you signed up (earlier gets the higher corral) when deciding how to split those people up into 2 corrals.
Long winded saying... turn something in. I don't see how it would hurt!