> The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
The MIT license has just one condition, but it's there. (If you don't want it, try 0-clause BSD.)
The original purpose of the MIT license was to require attribution: https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=926...
(From other comments, it sounds like Tailwind isn't a derivative of the copyrighted work in Windi, just the idea, so the MIT license is not relevant. But if the MIT license is relevant, the one and only thing the MIT license obligates you to do is to attribute the origin of the code. Even if you incorporate it into GPL'd software, even if you incorporate it into commercial software, the MIT license and the original copyright notice must be preserved.)