The Mirrorball Man wrote:
but I can assure you that it's not on the forefront of Stephen Moffat's preoccupations and has very little to do with his casting decisions.
While I might actually agree with your main point, you're way overstepping in the above.
No, you can't assure us about Moffat's preoccupations and casting rationale because you're not in Moffat's head. You can, however, give us your opinion on Moffat's thoughts.