Site structure: Segmenting a site and SEO after Panda

[Zivush]

I have a general question about site structure, inter-linking and SEO impact. Let’s have an example.

We have this site with a completely flat hierarchy - Practice which is used by most of the big sites.
All pages have this type of url - www.example/widget.html

There are 5 sectors on the site that are related in general, but not closely related.

Basically, a sector is a single page, which its link tab located in the upper menu (site upper toolbar).
On each of these sectors’ pages, topics (i.e. categories) are presented.

Each post of the site is presented (located) on its corresponding category.

Now, comes the question – SEO wise (after Panda), would you interlink cross-site or cross-sector?
Meaning –
A. a single post will contain links to other post from other sectors.
Or B. a single post will contain links only to posts from its sector.

Why is it so related to Panda? I learned that a weaker part of a site might affect another part. To isolate site from being vulnerable to Panda, practice A is preferred.
However, I need some more point of views, ideas and different thoughts.

[aakk9999]

I would:

A. a single post will contain links to other post from other sectors.

Moderately, and only when the other post is really relevant. The anchor used would generally be different than interlinking under B. below, i.e. more often than not the anchor would be a single word anchor, kind of like a reference only.

Or B. a single post will contain links only to posts from its sector.

I would link more freely than in A above, but again, only if relevant. The anchor would more likely to be a phrase rather than a single word.