Conte himself said the market is crazy, and he did not want to pay way over the odds for players. I think he's happy with the situation. Luiz was not his or the club's first choice, but he knows the club, the club won two European trophies with him, he is a utility player who can play anywhere along the back four and is outstanding in deep midfield.
Kante and Matic are looking very good at the moment, but they will at some point get injured, and Matic will probably lose form at some point. Luiz's distribution is world class, and not far off Fabregas there.
£50 odd million for Koulibaly could have been a total waste of money. He might not have fitted in. Look at Mangala.
Conte knows that each match is different and he needs options, he needs competition for places, and he needs players who know the PL and know the club. Now the club can genuinely challenge for the title, and before deadline day that was doubtful.
You have to look ahead. Terry and Cahill are looking very good at the moment, but how long will that last? Ivanovic? Still looks shaky even with the positive results.
Kante has said the he turned down mozza for Conte. Hear hear lad!