If you recall Conte's Juve, he limited Tevez to a more SS role playing closer to our 9, that's why the pair understood each other so well, many 1-2's suggesting both were always involved in our goals, directly or not.
With Allegri's system (AND without Pirlo) Tevez has more freedom and is playing like a true number 10, not "attached" to the other striker anymore and Dictating everything going forward. Llorente as an individual hasn't the best of skills and ends up being isolated, lacking services and really can't do much about it.
Without good crosses or the team closing the gap between the mid and Llorente, he'll find it ever so hard to turn things around and adapt to it. It's very likely Morata, given that he keeps it up, will bench Llorente.