The basic problem at the current time is that we dont have a simple man behind XAvi-Iniesta duo, able to create.. (We are running sort of centerbacks, creative mids and attackers..)
Cesc is playing rather in Iniesta position, and he definetely cannot (since today)play Xavi's genius passes nor balance the whole team as he does..
Given Tiago is promoted next year to first team, and Cesc is bought, we would still have problem in XAvi;s place.. And if he is absent, a game with Cec- Iniesta duo would easily fall apart against strong opponents.. Remember that.. Iniesta can play better than Cesc Xavi's role, but even he is not so reliable on the patient passing pattern of Xavi..
Only Dos Santos has a bit of his passing style, but he is still very immature..
Unfortunately Xavi is the king, who cannot be dethrowned easily or replaced easily..