Are you really thinking that we'll ever see Messi at RW again?? Even when we're using a CF, Leo plays right behind and not on the flank.
True, dunno if this has been posted on the forums but its interesting, average position placement of the Celta match
Tello seems to be more far from players as they were indeed using him as sort of a "second plan" attack, so much short passing on the right flank and more of the long passing toward the super fast Tello, Messi is obviously comfortable playing in central position, but in these current cercumstances i would play Villa CF and Messi kind of RW, SS behind Villa. Just my opinion.
But actually speaking i can care less about positions as long as Tello and Villa both start with Sanchez being a 75 minute sub or so.