You said "ideal" though; and ideally Everitt and/or Docherty along with some further improvement from Touhy, would allow for Walker to move forward without detracting from defense too greatly.
Similarly, Watson would "ideally" continue his improvement as a defender, of which he made great strides IMO at the backend of last season, along with McInnes who showed good things before doing his ACL in 2012 and after his comeback in 2013; and between them, would allow Henderson to move forward more permanently without leaving anything horribly undermanned. This happened last year anyway and while the defense wasn't as strong, it certainly wasn't as extreme as you're proposing.
So, you asked for an ideal situation and this is what I provided you. Like most teams not in the top 4, Carlton will require a few players to improve and outcomes to lean a certain way to deliver their best. If they can pull that off, they'll provide a much more soundly structured team than many expect.
Definitely respect your thoughts mate, i certainly think your list has improved over the off season.
I rate Carlton and think they can certainly improve on there finish from last season.