Chelsea have a new philosophy every 3 years. The initial investment was to play passing football, that's changed with Jose. I'm not sure of Jose's tactics regarding 433 but that seems to actually fit us better. Oscar is not a #10, we don't have a pogba/toure type player either. A 433 with Matic, oscar and koke looks pretty good to me. Saying all this, I'd stick to the 4231 and sign Pogba for 60+mil. I actually want him more than Costa.