Half a deck of banned characters? Not enough to slow him down from winning a record-setting 79th DT.
Common to see a half-deck of Montana and Uppers, with Zatman, Jackie CR, Lyse Teria CR, Mona, Vickie CR, and so forth ... And winning DT after DT after DT.
Player skill is undoubtedly an issue, but, the 2 point penalty is, clearly, not enough to slow the victories down. Increasing the penalty to 4 per card should bring the top-level decks back down to a level where others have a shot.
As it stands now, a brace of the Big Guns can rip through T1, using 2-4 banned characters, and walk away with the grand prize.