Just a suggestion as I had lots of frustration being unable to complete this Episode. I originally made my character a Centre, as I do in every basketball game. I go for a freakishly tall, freakishly fast shot blocker and that tends to dominate most basketball games on the defensive end. In this game, the punishment for making a centre is that you are only able to do a three-move combo on your "Act-A-Fool" (LB-X). When you create a guard, you can do a five-move combo. This will increase you to a Level 3 Shut'Em Down much quicker. Most games end when you get a Level 3 Shut 'Em Down.
Additionally for the Mike Bibby match at the end, if you use LT-RT-X, you can automatically get a steal (assuming that you have at least a "Shut 'Em Down" move). Then if you get the steal and to a 5 move combo and score, you have a "Shut 'Em Down" again, which allows you to get a steal. The requirement is to get 5 steals from Bibby and to win the game.
For the last match against Gilbert Arenas, you just need a Level 3 "Shut 'Em Down" dunk to finish the game within 5 minutes. Just keep doing LB-X and then dunking and you should be able to get it in no time. This was frustrating for me (as it took about ten attempts), but with some patience (and luck as you'll need a defensive stop probably) you can do it!