All I can take from this thread is that Lavia is a promising young player who could be an understudy to Casemeiro and assume his mantle as the long term No 6 in a couple of years. He has EPL experience.
Amrabat is apparently a better player according to some on this thread, but he is not a natural No 6, has never played in the EPL, has hardly shone at Fiorentina but had a decent World Cup.
My question is: If you are so confident in Casemeiro and therefore don't need a Number 6 for a couple of season, why would you not buy the younger EPL experienced player in Lavia which would give you future solidity in a difficult position as well as weaken Liverpool who have taken far too long to get this transfer over the line.
If Lavia is as promising as some on this thread claim, his value will at least double in the next 3-4 seasons.