By Jimmy Traina He says he still doesn’t know why the network moved on from him as its No. 1 NFL analyst. Rumors swirled throughout the 2021 NFL season that Fox’s Troy Aikman would be joining Amazon’s new Thursday Night Football package for the ’22 season. Many industry people expected Aikman to keep his Fox gig while working fewer games and work Amazon into his schedule. However, in a stunning development, ESPN jumped in and signed Aikman to a five-year deal to call Monday Night Football. Aikman appeared on the latest SI Media Podcast and talked about the move. When asked why Fox let him join…