I think they shouldn't let us choose his pact, tbh. When we meet him, he should be at least level 2 already and have his pact set as Pact of the Blade instead of giving him a free Rapier weapon Prof.
Problem here is replayability ...
If you give him Pact of the Blade, his character will be a lot more focused to certain gameplay, than when you make him lvl 1 and let people play him however they want ...