I think you might be watching #20 or #90 or #21 recently and not #10. Erat has been one of the better forwards since he's been moved up the lineup and given more minutes. He's got 7 points in his last 9. If you go back over his last 18 games, he's been on a 55 point pace, which is right in line with his numbers from time in Nashville. I'm probably more partial to Erat than most, but he's been one of the better Caps players when it comes to puck protection/possession and hasn't looked out of place on the PP at all when given a chance.
It isn't the case of a high tide raising all ships either. Brouwer has 5 points in his last 15. Laich has 4 points in his last 21 games. Mojo has 2 in his last 9.