Busquets would stay if Messi returned

Sergio Busquets is a free agent this summer, until something changes. He's got an offer from Barca on the table meaning he could stay. For now, he hasn't answered, but he's thinking about doing so before the end of the month.
'Mundo Deportivo' claim that he could stay at Barcelona, and the reason being Leo Messi. The captain is keen on continuing his career as a Barca player because he thinks the man from Rosario is going to return to what was his once home.
Busquets has a great friendship with Messi. So much so that not only he is thinking of playing another season with his, but also in the long term. The plan would be to go to an alternative league such as the MLS or Saudi Arabia together.
Barca's renewal offer they've made the midfielder is a downgrade. Therefore if he stays, it won't be for the money: it would mean more to him to be able to play with Messi once more.
Barcelona's big dream is to get Leo Messi back for next season. His contract at PSG ends ion June and, although the French side have offered for him to stay, the Argentine has still not given the all-clear, meaning the Camp Nou are believing in his return.
Barca are optimistic. A lot of people are dreaming of seeing Busquets with the Argentine again, celebrating goals and titles.