Just gonna quote myself from the other thread...
Based on what Imran has said I can see why people are compelled to throw out crazy predictions and I am also tempted to think it's something that falls outside of Nintendo's area of expertise. Shooters in particular are something I've repeatedly said they're lacking in and there isn't a shortage of cancelled ones. However, knowing Nintendo and how reluctant they are towards certain industry trends, I doubt that this is going to be some kind of AAA game.
I think it's more likely that it's an interesting project that can be finished in a reasonable timeframe and people with ties to Nintendo wanted to go back to but couldn't for whatever reason. Considering those circumstances and barring further evidence I still believe the most likely game to be revived is Sakaguchi's Cry On that was meant to come out for the 360. There are multiple reasons for why I believe it's this game in particular:
Back in 2005, he said that the game's development could be finished in 1.5-2 years. This obviously didn't pan out because of financial difficulties but wouldn't be an issue under Nintendo. To add to that, Nintendo seems to have a good relationship to the companies involved. Cavia and AQ Interactive are now merged into Marvelous and Nintendo has already worked on two projects with Mistwalker, namely Archaic Sealed Heat and The Last Story.
Last year Sakaguchi also teased that he's working on something new and I know that his wording implies something completely new but I wouldn't necessarily rule out him going back to Cry On. The final reason is that if you read the game's description in the first article I linked to, it sound like something very unique that could be potentially tweaked to include a 2-player co-op mode on Switch.
All this said, I am totally ready to be completely wrong. In the meantime I will rewatch the trailer the Gooch leaked in 2014: