Here’s the problem though, what the hell is Diana doing during the ending then? She’s not going to just stand around while Steve and his gang are doing all of this fighting and she’s just standing there feeling upset that Ares isn’t there.

I agree wholeheartedly about the ending being a bit cheapened by the reveal, but after seeing it again last week I can tell you that it’s going to be a real challenge making the ending work. Diana wouldn’t let Steve just sacrifice himself because she was willing to do that.