I don't think he's getting in ahead of Kovacic, but agree that Ross is definitely in Sarri's plans.
Ross could have been the Loftus-Cheek type, and that's what he started off as. A marauding, powerful player with pace and an eye for a goal/pass.
Due to a combination of injuries and management (I believe mismanagement, especially from Martinez), Ross naturally developed into a player better suited to a slightly deeper role if played in midfield, imo. And he should be looking at Kovacic as a perfect example of a player around the same age who has taken his game to the next level, and also a similar style of player.
If Ross is ever going to be a 'marauding' runner again, like he was in 13-14, then he has to start in a wider position with the freedom to roam (which is where his best form in 16-17 under Koeman came).