The small change to the concept is a BIG improvement. The warrior now running with the lead as opposed to jumping to certain death is far more believable.
As for the alien concept… don’t worry that you think it looks like something else, unfortunately we all get inspired by things, especially movies, and often the inspiration goes too far (I did one concept that, without realising, was a complete copy of on movie’s big ending). So just take a step back, have a good think, and I’m sure the idea will come to you.
Good luck in finding a cool alien concept, and I look forward to seeing it when you do.