I think that's the key, right? Can he calm things down. From what I've seen, he's stood at the edge of the water while his team has been making show moves at bipartisanship. The only way you lead this country is if you actually lead it. Obama seemed like he would unite everyone, but really only worked for the left. Trump made no promises to unite everyone and really only worked for the far right. Biden claims he wants to work with both sides. The minute he decides to use budget reconciliation to ram things through the Senate, the bulk of his inauguration speech will be rendered null and void.
Biden is one of the few Senators around who remembers what it was like when the Senate worked together. I'd hate to see the fringe of his party pull him away from that.