Shooting really isn't a way for a barca midfielder to endear himself to the club. Their midfielders rarely shoot and when the do they get the old messi stare. If he is a better dribbler, he's just slightly better but a long way away from iniesta, busquets or xavi. Another strong point of rakitic is his set pieces, but seeing how few Neymar took, I'd say he won't be taking many more if any.
His qualities aren't there, but that's because they're not what they normally want in a midfielder. Xavi, busquets and iniesta are to prototype. Retain the ball in tight spaces, pass it horizontally till clear opportunity presents itself, suffocate opposition midfields and piercing midfield lines with combinations or dribbling(iniesta) is what they specialise in. Give them something different they snub it. Mascherano when he set foot there tried to give them steel and energy, was sent to the defence shortly after. Song has tried to give them strength and adventurous passing, been demoted to a garbage time player. Cesc tried to be more direct and adventurous, now he's getting sold for his troubles Even the heir to the throne(thiago) was at times accused of being reckless with the ball despite his very high level of ball retention.
Yes, there are obviously slight differences in Ivan and cesc's games(shooting, defensive contribution and set pieces the glaring ones) but not enough for him to succeed if they don't change their approach IMO. He's just as direct, he's just as sloppy on the ball, and his 1 touch play is probably worse. The factors that have forced cesc to see the door and I really do due to that have my doubts over whether this will be any different. He'd be better off heading to the prem.