How the hell will Henderson be the box breaking AM? I'd struggle to see him as the passer even. My gut is that his best position finally, given his lack of outstanding ability and physicality, will be the holding role.
Of the current squad, if I had to replicate Rodgers' three-man midfield idea, I'd pick (A) Lucas - holding player; (B) Shelvey - the passer; and (C) Gerrard - the AM.
And contrary to popular perception, my opinion, for what it's worth, is that the AM position offers the best bet for Gerrard to conserve energy, and get the most out of what is left in his tank. One of the biggest misnomers about Gerrard is that he's been great purely because of his undeniable power and pace. While that's made him stand out, people tend to forget he's a sublime footballer as well, with skills which stand out in the attacking third. His vision, touch, shot, game intelligence are all off the charts. That said, there is one ability he's always lacked, and that's the ability to sit, and rotate the ball or set the tempo. That's just not in his DNA, he has one-mode - play the ball forward; look for the killer ball, or shot - all the time. It's why he should play in the final third, whether behind the striker, or in a free role on the right - it's where he's been at his best, and it's where he will continue to be his best IMO, notwithstanding his diminishing pace and power.