>>532352870
The usual method is to pick the 4 most compatible horses. However, both parents having won the same G1 cups is quite relevant (at least after a later update, now it's there but isn't as powerful)

>>531680950

>>715510443
oguri cap is reddit
use it on special week or mcqueen for inheritance reasons

>>530695576
>Do i need to be concerned about legacies, affinities and sparks for now?
if you want to do some endgame minmaxing
> If yes, then what should i do?
pic related should be enough for you to start with
>If not, then... when should i?
whenever you feel like
right now i'm just filling out my pvp teams, i'll do breeding for later once i have the spare energy

>>530639450
it's decent, but a 2 star stam/power would be better imo, speed is the easiest stat to train and urara has shit affinity with everyone, so there's less chance the sparks trigger.

>>530504063
>the further to the left the more affinity they have, the further to the right the less affinity
basically umas that run similar distances and types are compatible. long umas are compatible with long umas, sprint umas are compatible with sprint umas.

>>530465826
Oguri is decent 2nd place

>>713974771
you're supposed to do all of them for inheritance

old inheritance compatibility
might help which to pick on a reroll