One assist from Kovacic yesterday and you're shouting from the rooftop. If he can suddenly provide assists and even score goals on a regular basis, then great but otherwise I am not convinced at all. This is a player who has only 11 assists (and 5 goals) in all competitions since the start of the 2015/16 season. His most productive years were for Inter in 2014/15 and Dinamo Zagreb in 2011/12.
Also, if you're gonna say Kovacic will do X, Y, Z better when played in position X, then one could argue the same about Mount, who has said and looks so much better as one of the 3 midfielders in a 4-3-3 as opposed to a #10 or a winger.