My main thought stems from this. We only ever started considering Ryu because of a leak. Nothing more.
It's really frustrating to see people boil Hayabusa down to this, considering Ninja Gaiden's legacy as a classic NES title and Koei Tecmo's own influence on Nintendo properties. "We" didn't only start considering him beccause he showed up in a 4chan leak. Maybe
you did, but he was on my mind as far back as Simon's reveal as the next 'NES icon' in line.
It's impossible for me to say where Hayabusa would stand if not for those leaks in the community as a whole, but I like to think people would have gotten the idea considering Koei Tecmo is ****ing everywhere now. The leaks really don't greatly affect his chances one way or the other anyway.
Nintendo support. What characters did nintendo see fit. Last 3 have felt like Nintendo mandates (not complaining. I like MinMin and Steve)., I personally cannot see Ryu as a nintendo mandate.
And this is the major flaw here. You highlight why you believe certain other characters were added, for a variety reasons such as throwing companies a bone, fan demand and Sakurai's own influence... and then since the last three characters were supposedly "Nintendo support", the whole rest of the pass will also fit that arbitrary label? What happened to all the other reasons? You can't make these assumptions based on two characters, the latter (Steve) barely even qualifying for the criteria you made up in the first place. I don't see why Steve is 'Nintendo influence' any more than someone like Hero was. In fact, every single DLC pick was Nintendo influence because they chose all the characters.
Not to mention... Koei Tecmo is irrefutably the single closest third party partner to Nintendo without a playable character in Smash. Even if you wanted to believe that FP2 was all 'Nintendo-y' picks whatever that means, Hayabusa
still qualifies for that because Koei Tecmo is EXTREMELY tight with Nintendo right now. Not to mention that Nintendo absolutely loves to celebrate NES nostalgia, and Ninja Gaiden is consistently right there alongside Super Mario Bros and Legend of Zelda on NSO and the NES Classic edition.
This reasoning against Hayabusa is just completely arbitrary dude.