I think we'll wait a while for riding. We didn't get much time to ride her before she started "showing", and after that, we didn't ride her at all. The same is true for Sugar. We will probably concentrate on Lightening for now. He's just green broke, so he needs a lot of work (more than we've had time for lately).
You thought about gelding him?
That's good. It will be good for Lightning too - keep his mind busy.