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It's not that I think either DS or DD will become average but in the top 10% there is a lot of room for other factors than pure intelligence.

Yes, I 100% agree and this is how I feel as well. My kids will probably stay in the top 10%, barring major issues (which is not totally impossible--DD is going to be a tough teen). But there is much ahead of us, and I don't know how things will play out. I actually think one of my children is brighter than the other but that that child is not as internally motivated.