From what I've read, they don't have to be halter horse quality, but they do need to be balanced and show the desired conformation for a future pleasure mount, but it's mostly judged on movement.
I have a colt the same age who I'm planning on taking out next year, but he has halter performance breeding so either way he's got a great shot. I honestly have no idea what the quality of the ApHC is in the LL classes, maybe look up youtube?
I've got a lovely bunch of Neuticals,
There they are all standing in a row
Big ones, small ones, some as big as your head