I still contend that he's not 100% fit, and he's not as happy as he used to be because of his friendship with Michael Olise. Lacking full fitness, he can't defend as well as he'd like (and as we'd like). Lacking his good mate, he doesn't play with quite the same élan that he did at his peak.
If his return to full fitness coincides with warmer weather, and Wharton (and perhaps Chilwell) bring a bit of more of an attacking mindset to the center of the pitch, I suspect we'll see more frequent flashes of Ebs's brilliance in the spring.