My thoughts:
Sinestro is all about space control. His Fear blast is great at blowing up people who try to dash in, which means that they either have to walk back, duck it, or jump. The jump is the easiest option to cover since Sinestro has one of the best D2's in the game. It starts to get tricky once they learn to walk back, and especially when they know to duck the projectile. Almost all of Sinestro's normals are stubby, except B1,3. The problem is that B1,3 is full combo punishable on block. Thankfully, Sinestro has one of the better dashes. This allows him to take advantage of the opponent's hesitancy and to come in with D1, F2, or throw. While Sinestro's D1 is pretty short range, it leads to an almost guaranteed mixup on hit. You can either throw, go for F2,D1, or B2.The D1 is only slightly negative on block, so it carries very little risk