I found interesting what Max said in the fio post match conference; the introduction of costa gave us more control of the centre
we switched from the 433/451 to 4231/442 with costa in the middle
this might be useful against spurs who dont attack much down the wings and tend to play through the centre to feed kane and son
Even if we start with the 433, I expect us to switch to to 4231 at some point given spurs also play 4231