JonSmash, we get it, really we do. There aren't 6,000+ posts in this thread because we don't like Banjo. You're allowed to have feelings. But like the poster above you said, we don't know the situation surrounding Banjo. Maybe Phil really wasn't willing to make a deal, maybe he was asking too much, maybe Rare wanted to hold off for a little if they really have a BK revival planned and didn't want Smash to lessen the impact, maybe Nintendo really didn't want to bring back the duo quite yet, or maybe there is a myriad of business complications that came in the way. The big hitters that got in this Smash game are K.Rool, Ridley, and Inkling, all which Nintendo owns rights to. (Yeah, Rool was a Rare bro, but my understanding is that Nintendo kept DK rights.)
There's a good chance we'll never know the details leading up to character inclusion or lack thereof, which doesn't help. But please don't let speculating hurt your health.