Yeah, he played in Fiorentina's 3-5-2 a lot. The only thing I find strange is that Allegri has never tried Cuadrado in other roles. He was lethal for Fiorentina in the central and left areas of the pitch as well.
Yeh, sturaro specially is a good defensive option for RB. He doesnt need t be marvelous there and just keep composed. He is a good back up for the middle and for RB