I have to say, this has crossed my mind a lot recently. Although, to be fair, Carroll has been alright this season (when fit).
I'd also like to point out that when running with the ball, Benteke isn't exactly graceful either. (Aside from his goal against Chelsea). I remember laughing at that run he made against United at home when he KO'd Smalling, because the ball came off his shins like three times but somehow managed to keep the ball.
Don't get me wrong, I love Benteke, but whether he can be as good next season remains to be seen. I take reassurance though from the great improvements he made last season. He was being slated after his first few games, and looked a bit lost in all honesty. But as soon as he got his confidence up and settled in, he showed remarkable improvement in a very short space of time. If he continues his development at the same pace he has been, he'll be one of the elite Premier League strikers. If.