Sometimes we have people asking why we didn't sign Gunter over the summer. In hindsight it's a position we probably needed more cover in but that's because Bacuna is needed in midfield and not because he doesn't fit the RB role this team employs. If we assume Bennett (trusted to play at CB on last weekend) and Bagan (played CB at youth level, may end up there for senior side) are going to be our LB's next year then it suggests we've got an identity for that area of the pitch too.
Regarding Harris' transfer activity as a whole, I'm not sure extending Nelson will be seen as good in a few years but think it was the right move at the time and the rest of the activity has been good despite reducing squad depth for this year being a risk. Moodybluebird's post (and I'm paraphrasing) above that the lingering question is whether we have the right manager to bring out the best of them when they're through the door is, I think, a fair one.