So you have late breds. As far as I am concerned these are as good as any may be better. Treat 'em with respect don't train in the cold winter. Don't pair up too early, and don't start them till the end of may as yearlings. If you've not knocked their confidence and kept 'em healthy, I would think they will get you more than a few red cards in june.
I have late breds from last year and the year before hear, nothing older to race as we moved house and these will not see a basket till may. I've paired up this week. A week later than would be normal, for me, as I like to pair mid march.