when jags is back, i wouldn't mind if he went 5 at the back to be honest, i can't choose who i'd rather him bench out of stones and mori, being one reason.
how you structure the rest is a bit of a mystery, Barry won't be dropped and rightly so because of his performances, but he wouldn't really be needed with all the defensive protection. Ideally you'd have barkley and mccarthy/cleverley ahead as two box to box midfielders, they mirallas and deula on opposite wings, behind lukaku. Would that be too attacking? Can always mix it up and have lennon instead of mirallas, as he'll track back more, or cleverley there instead.
We have a lot of options anyway, if he shows this as an intent to try and shore up our defence, at least it'll be a step in the right direction.