We all love to see him in better league but i doubt the kid is still mentality ready, what make people think he would be starter in Lazio? I kind of understand his decision, it is WC year and he needs playing time, specially with crazy competition upfront: Gucci, Karimi, Kaveh, Taremi, add to that Sasan Ansari, few other IPL forwards and possibly Saman Ghoddos. In other hand he is not playing in CL or Europa League this year as part of Kazan, so he is losing the chance to attract the attention of scouts, and as Nader said with CQ system, i doubt we score more than 2 or 3 goals at best next year.
He is still very young(22) but he needs to make his mind after WC, the only concern is will he still have some tempting offers or not?!