I feel that we need to make an official announcement about this, lest people start going "hey, they said they were going to do X and aren't. Unreliable devs! Pitchforks!".
Originally, the plan was to always bundle the base versions of the Army games with the Black GOAT versions in any future discount sale, but after having both internal as well as external discussions, we feel that it is in everyone's best interest to keep them separate.
We honestly thought that people would want to have the option of both discounted products during the same sale, but found that it just ended up being really confusing. We also didn't/don't want to run the risk of someone buying the same exact product during a sale.
It also comes down to choice: if someone is looking to buy Army 1 to test it out, they are going to buy Army 1, regardless of the price of the GOAT Edition. And if someone is going to refund one of our games based on a test run, it is really not in our best interest for it to be the higher priced one. Refunded DLC is much better than a refunded fully priced game.
As for official Steam sales such as the Summer and Winter sales, both will be on sale at the same time.