That amount of $10,000 is too low for Claymore. I believe that he earned hundreds of thousands from his miners.
There are countless people who will compete for the development, he's not the god of miners.
Don't recall raising Claymore to deity status, perhaps I was drunk and forgot about that post...
The fact is, he has done well with ETH and XMR miners. No reason to believe he wouldn't build a competitive / enhanced miner for equihash (Zcash) as well.
As of now, there are no publicly available GPU miners for this algo. So a 99% dev fee would be better than what is available..