How was this match the exact same circumstances?
Masch has played better this season in the matches that are more comparable.
The circumstances being Mascherano performing poorly because of the poor system. A system that hasn't actually changed since Busquets has been playing poorly.
Masch played better against shit teams, which up until now was the only type of team Lucho would use him as CDM for. As it was shown against Valencia, in a big game he is nowhere near being the CDM we actually need, and anyone trying to compare his performance to Busi played as a CM are just showing how desperate they are to put Busquets down despite him being a superior Barca CDM.