I agree that the training for the colt determines his value. But in my opinion, if he has 3-4 traits up week 4, send him to auction here at the forums. That would be really strong training with LB potential, and I'd think you could get close to a mil, possibly more
For reference, I sold an EEE SH colt for 900k just two seasons ago, with no bars up week 4. But he also came from an ABLB sire and eventing LB mare.