Especially if those other cells are not big fans of Barret, could make for some interesting character interactions, particularly at Fort Condor. The denizens of the Fort want to protect the reactor in order to protect the Condor, while Barret would more likely be inclined to just blow the reactor up, Condors be damned. After all, the reactor is hurting the planet. With different members of your team falling on different points of that spectrum.
I would say that other hypothetical cells shouldn't be outright hostile to Barret, though, because that would lessen the impact of how much the people of North Corel hate him. However, having people that fundamentally agree with him, but have a difference of opinion with him in regards of how to go about it could be really enjoyable and interesting. And, I suppose with Barret preaching his Avalanche gospel and arguing his position all along the way, but approaching and in Corel he clams up as in the original, it could still feel distinct.
Really, anything that involves more focus on Barret's character is a-okay by me.