Hasbro and Lucasfilm weren't wrong in naming the red b-wing-suited Sullustan "Nien Nunb", during the briefing scene in ROTJ, you can see clearly that Nien is standing right next to Lando, and he's wearing a red B-wing pilot costume. I'll attach a still showing him next to Lando:
You can tell it's Nien because A) he's standing next to Lando, and B) he's wearing his flight cap (which Hasbro did not produce with the recent flight suit Nien Nunb figure). Here's another shot of Nien from a different angle (you can see Wedge standing on his right side and make out Lando's cape on his left) where the hoses on his B-wing pilot costume are present:
But stranger, a few minutes earlier, there's a long shot of Lando & Nien Nunb, and Nien is TALLER than Lando!
This blows my mind a little, it counters 2 notions I had always carried:
- that Nien Nunb was always *just* the guy in the Falcon costume, and
- that Nien Nunb was a pretty small guy.
It also puts into question the very existence of Ten Numb, the "other" Sullustan that's in a white B-wing costume as seen in the movie's production materials. Nien Nunb is back in his red B-wing pilot duds and hat at the end of the film during the celebration, but there are no white B-wing outfit-wearing Sullustans in the film at all that I can see, and none without a hat.
That said, the hat Nien wears is merely the same flight helmet that Ten Numb has always had, but without the earpieces and chinstrap. So is that just a generic Sullustan hat that has earpieces clamped on, and for no reason at all, Ten Numb wears red in the film and is standing next to Lando during the briefing? I'm not buying it, but there is still wiggle room.