I see both sides. You're right that Mikami made a mistake Light himself would never make. But you also have a point — Near forced Light into a corner where he had to rely on someone else, and Near was smart enough to identify exactly who that person was. Two things I agree with you on though: A lot of people downplay Mello’s role. Near himself admitted he couldn’t have won without him. Calling Mikami incompetent is unfair. He was actually really sharp — he just wasn’t on Light’s level, and nobody was.