Haha, I can think of plenty !
Ross hasn't played that role for us, well, hardly ever, and it'd be a risk for Spurs to buy him purely with that in mind, but I can see that Pochettino might be thinking in trying Barkley in a similar role to Dembele, it wouldn't be a 100% lfl replacement, nothing ever is.
After all, if they paid 25 to 30 million for him ,stuck him on a four year contract and, after a couple of years they decided he couldn't be trained into that kind of role then they'd likely just sell him on for a profit with no real harm done to their club.