I would say that he DOES still have pretty good damage. He has a lot of really simple combos that do between 250 and 400 without using too much meter...However, that seems to be a pretty hard plateau that requires a lot of stocks or using HD to pass. cl.B, f+A,A, qcf+C, super cancel ya otome - saika does around 450 (2 stocks, 1 drive), i think, but getting over 500 takes some doing
On the otherhand, claw Iori's normal corner BnB does like 470-500 (and is easy) depending on what you use as a starter for 1 stock and one drive, and adding more stocks/drives can easily boost it up to like 700. I don't think there is any doubt that EX iori's dp is much better (normal and EX), and being able to zone a bit helps him too