I think Barkley could effectively play that secondary striker role, like Dele does for Spurs. Just needs to be given license to try things without worrying about losing the ball.
Looking at our squad now we lack a bit of pace and power going forwards. Barkley gives us that, it'd be great if he came back on board.
I don't think he has Dele's movement to play that role, Dele is constantly on the move making angles and getting in the box if anything Dembele is the nearest 'type of' player to Barkley they both are better on the ball than off it.