I believe Bell and Rogers are required by a shareholders agreement to vote the same way on all material decisions to avoid Tanenbaum getting leverage over one of them. So, it makes perfect sense to have Leiweke make the call on two levels.
Sources say the board representatives for Rogers and Bell, led by BCE chief executive officer George Cope and Rogers CEO Nadir Mohamed, have ceded the decision to Leiweke, who has NBA ties dating back to his days as the president of the Denver Nuggets until 1995. Rogers and Bell each own 37.5% of MLSE, and have agreed to vote as a bloc; neither is believed to be in favour of retaining Colangelo, but in this case they are not making the final call. Leiweke, the former CEO of sports giant AEG, is in charge.