Joe Brock owns 10000 of the 60000 outstanding shares of Big Corporation; Leslie

Joe Brock owns 10000 of the 60000 outstanding shares of Big Corporation; Leslie Ross own 20000 shares; Mark Jones and his twin brother Sam each own 5000 shares; and about 300 other shareholders own the remaining 20000 shareswith no one other shareholder owning more than 1000 shares. According to the provisions of SFAS 94 since Leslie owns half of the outstanding shares he in general controls Big Corporation and thus should consolidate his interest with that of the corporation. However Joe Brock is unhappy with Marks management decisions and plans to challenge his authority. What factors arise in considering if a minority investor can maintain such control or even prevent others from exercising such control?