While this squad is considered one of the more weaker ones in recent seasons, it's still the best squad he's ever had. He was hamstrung to either low budgets or having to promote from within/buying Basque only players at Bilbao.
Despite never having the chance to spend big bucks on players, His greatest strengths ended up helping us big time not just on a tactical side but also knowing how to get more out of his players and figuring out who deserves to stay and who goes.
He's probably well aware of Coutinho, even if he didn't have much of a say but to him it's more options and a good chance of finally transitioning from heavily relying on Iniesta to more of a Xavi role like under Lucho's first season.