Shelli Reis sells to trainers for their customers, your sister may check those horses out and then ask her trainer about some she may like. The trainer would discuss with Shelli to see if that horse would be suitable, is how many reiners are sold.
Reiners start showing in their third year, not second and the Futurity is at the end of that year.
If we follow the newer studies on how horses learn and perform best, starting them —PROPERLY— all along for their age will give them their best chance of performing the longest and soundest.
Similar to a kid starting in school to train and play and after years of training becoming a pro, something a kid not growing with that early training and experience playing won’t be able to ever become that competitive:
Many reiners are still showing in their late teens and early 20’s, we had several.
Many reiners that are started as reiners are not competitive and sold for other and are still being ridden into their old age.
Is not the age you start a horse, but that you do that right for that horse and your goals for that horse.
A horse started older will also not stay sound if the trainer pushes it past it’s fitness.
I know offhand several reiners still showing and winning at a lower level, with beginners and juniors, around 20 years old.
As for the FEI and reiners, there are more than one side to all stories, also in that one.
The FEI wanted to be in charge of all reiners, administratively.
Reining associations didn’t think it was in their best interest to do so, they are doing fine on their own.