Why stop at just one new member? The original Evolution had a representive of the past in Flair, the present in Triple H, an enforcer in Batista, and the future star Randy Orton. They could fill each of these rules again. Trips as the past, Orton as the present, Sheamus as the enforcer, and Barrett as the future. Unless there is someone they plan on bringing up from NXT to be future instead. If it just ends up remaining a three person group and Sheamus takes Batista's spot, then I am fine with that. He is good friends with Triple H in real life and Sheamus has worked with Trips as well as Orton previously. I'd argue he would add more to the group than Batista currently does. I'm pretty open to a new member joining Evolution as long as it's not somebody who sucks. Sheamus and/or Barrett are as good a choice as any. If only Drew McIntyre were still in his Chosen One gimmick, it would be perfect for him.