I'll touch on the scizor/steel issue first since some people seem to be freaking out about it. I don't think it's going to be much of a problem really. Scizor has a very low speed stat so assuming we are faster, have rocks up, and have access to some sort of coverage move that can at least put a dent in scizor we should be fine. However, I don't think we should be destroying steel types either so I propose that we both can threaten offensive steel types (such as scizor, heatran, lucario) and are also threatened by them. So something like neither would really enjoy switching in on the other. Then with defensive steel types (forretress, ferrothorn) we should threaten them but not be threatened by them. They may be able to take a few more hits but they shouldn't be able to hit back hard. I think this is a good balance that keeps cap5 from being too powerful, but also allows it to avoid being shut down by a pretty common rain threat.
Keldeo was mentioned earlier and I think this should be the same deal as the offensive steel types where neither would really enjoy coming in on each other. However, cap5 should have the slight advantage since keldeo is such a huge threat to sun. Maybe something like cap5 Hausa chance to ohko after stealth rock but is outsped by keldeo and takes around 60%- 75% from timid scarf sets depending on our nature and Ev's.
Lastly, I also agree that the lati twins are the only dragons we should be threatening and all other dragons should be threatening to us. We should be opening up slots for other threats to dragons such as mamoswine, an extra steel or a scarfed dragon of our own so they shouldn't be too much of a problem anyways.