Based on what? Half a season at Chelsea? He is in the midst of the worst season of his career, and that includes the first six months of it under Conte, where his goal+assist production was significantly lower than during his half season under Allegri. Conte, the guy everyone last winter was banging on about getting the best of Dejan. He’s been appalling this season.
He had 10 g+ 9 a at Parma in a full season. 7 g + 7a in a full season under Pirlo. 7 g + 11 a in a full season split between Allegri and Conte. And now 2 g + 7 a with a couple weeks left after most of the season under Conte again.
So where exactly are you getting the idea from that he’s gonna be a consistent 10 goals + 15 assists a season player? Since he’s never come close to 15 assists and has hit 10 goals once, 4 years ago.