Its good to slpit the pelvis so the cavity can open up more and be able to cool.Especially on warmer days.
A Butcher always told me that any exposed meat is likely to not be good unless you butcher the deer right away. Where I hunt, it takes about 4 days for us to get to cut up our deer. I just make about a 12" long cut to gut the deer, then cut around the anus to oull it out either from outside or inside, very little exposed meat.