I agree with this.I'm pretty sure part of the succes of AOS comes from 9th. Start collecting sets are a bargain, and in their report all goes to AOS credit, but if you check GW website you can see than some out of stock entries are the ones good for 9th.
I won't say how many % there is, but i'm pretty sure it is something considerable.
Also, why is FW bringing long dead models back. Like these two? I think they know people are still playing. Be it Reforged, or T9A or 7th, who cares? But there's still business.