I would be happy with Richy/Son as the CFs and Lankshear off the bench for 15-20 mins.
I think Lankshear has the intelligence of movement (he sees near-post runs for nexample, love that) and he is a lot more than just physicality and 'thump'. He knows how to be where you need to score goals, and he's a presence. From what I'm seeing he has the personality to step up. IF we sell Richy I'd expect us to buy a replacement, but otherwise I see no need for a forward like that.
@Finney Is Back he's a kid so yes, he has plenty to learn, but he shows the appetite to want to, the hunger to do so, and already has enough about him in terms of reading moments to be an impact off the bench. His height and physicality does also give you an option in terms of style should you want to go basic. I personally have seen enough in his intelligent movement (last season not just in two friendlies BTW) to convince me he is a real talent. I think he could surprise us. The logic of a good (emphasis on good) loan is sound, but I'd be inclined to take the punt here and see how he does.