True, but I have to think that for younger casuals who maybe didn't know they would have google'd it in quick order.
I'm not really bashing the decisions with the marketing because even the hint of mystery is probably better than nothing at all, but I just found it funny.
Regardless, this isn't a Captain America discussion. I'm mostly just saying that film studios and the toy companies that work with them have long tried to trick the audiences with this kind of thing.
Another case being Batman Begins where Liam Neeson's Ra's was depicted as Henri Ducard in the toyline with Ken Watanabe's decoy Ra's action figure being sold as Ra's al Ghul.
It's not that uncommon a practice and I don't think Paramount and Hasbro were out on some crazy misadventure trying to portray the Quintessons as the main villains in the marketing. It's pretty standard, especially in franchise movies.
There's a lot we can blame about this movie's off-screen issues on Paramount and Hasbro, but them making a Quintesson toy for the Walmart assortment isn't one of them.