As you can see here, KdB is
6th in the league for xT from carries by attacking midfeilders (only marginally behind league leaders Grealish and Kulusevski) and Bruno is 19th (with 1/3rd of the xT per 90 of KdB).
Both in terms of dribbling and ball carrying, KdB is much more of a threat.
For what it's worth, McTominay has even less xT per 90 than Bruno, because ball carrying from deep isn't weighted as highly... so if KdB really was playing "the Eriksen role" he's have to be an order of magnitude better than Bruno at ball carrying to be so far ahead.