I would not be surprised if these other manufacturers announcing rigs for sale with 40k and 50k sol's see the writing on the wall and are beginning to sell USED hardware that they clean up real good before shipping to buyers. This is looking very similar to Cryptonight before the fork to Cryptonight V7.
Zec won't fork, at least for Batch1. Bitmain's already paid them. Thats why if you look at the price point of the Z9 batch 1 it started immediately at $2000 compared to the E3's initial price at $800. They couldn't buy Ethereum. It actually says about the dev teams. Ethereum is incorruptible, but Zec is a shitload of money hungry sluts.