This is a good video showcasing all Raging Demon Daigo Umehara made at Canada Cup's Master Series.
Umehara is now used to Evil Ryu as you can see almost no combo drop in an entire tournament (very different from mid-2014). He started using kara RD (cancelling hop kick into RD) in a real match since Capcom Pro Tour Asia, and the technique now plays an important role in his gameplay.
With how he plays the character now, the fans slowly forget about his Ryu, because his Evil Ryu still shows strong footsie and his main source of damage comes from open play (as opposed to set play such as okizeme cross-up).
Although Umehara's Evil Ryu is already impressive, and is the best Evil Ryu ever, perhaps it's too early to say it's at full potential, knowing how good he is.