Not really his sidekick, but the other Lantern.
IMDb was the first to say Reynolds was the Lantern, and the first to show Evans was Captain America. It’s never wrong. Ever.
The latest news is that Guy Gardner, the other Green Lantern has found it’s actor. Eric Johnston! He plays Flash Gordon in the SciFy channel.
So I was kinda hoping Brendad Foster would get this role but whatever.