This is a tricky question. Firstly, I've studied under Michael Hicks, which may have coloured my understanding of Richard. Hicks... well, he's not a fan. To be honest, I think some of his work is a reaction against some of the overly Ricardian scholarship of the eighties and nineties (some sponsored by the Richard III society). I think he goes a bit far in painting him as acquisitive and grasping, but some of his work has probably stuck with me. It's quite possible that Richard did love Anne. They grew up together for quite a time, so it's eminently possible. That being said, she also brought a metric f*ckton of land with her, which can't be ignored.
Richard was ambitious, wanting land of his own, and he engaged in quite a few swaps to try and build a contiguous territory, rather than scattered holdings here and there. Whether he was more grasping than any other noble of the time probably depends on your own view. There were some shenanigans around his treatment of the Countess of Oxford, and he, along with Clarence, were even worse to the Countess of Warwick (their mother in law), eventually getting Edward IV's permission to act 'as if she were already dead', thus depriving her of any dower lands. If it wasn't for the Woodevilles and Clarence, he'd look worse, but they both seem to have went further than him.
Oh, this hypothetical Neville will likely be very close to both Richard and George. They'll grow up together. Now, little Neville's loyalties will be interesting. Will he cleave to Daddy, or the King? Clarence, or Gloucester?