That’s a good question.
The Stallion WordPress SEO Plugin only covers a very small SEO issue related to not wasting link benefit using nofollow/noindex. Think of this plugin as the solution to a very small, but important SEO issue, not the be all and end all of SEO plugins.
So, if there are features within Yoast/All In One SEO you must have that are not replicated by a theme or other plugin, then no the Stallion SEO Plugin does not replicate Yoast/All In One.
I develop the Stallion Responsive theme (note Theme) https://stallion-theme.co.uk/stallion-responsive-theme/ which includes the Stallion SEO Plugin features, similar features to Yoast/All In One SEO and dozens of other SEO features (it’s probably the most feature rich theme online today: there’s over 1,000 options with millions of combinations) not covered by any other theme/plugin.
To give an example, Yoast/All In One SEO includes an SEO Title Tag which basically replaces your WordPress Posts Titles as the hidden Title Tag (important SEO wise).
Yoast/All In One SEO only use the SEO Title Tag data (what you add when editing a post) for the hidden Title Tag. Stallion Responsive replicates the Yoast/All In One SEO title tag (will use your current Yoast/All In One SEO data) and uses it for the hidden title tag (same as the plugins), but also uses the SEO Title Tag in other important SEO areas like the anchor text for internal links.
Stallion Responsive is the only theme I know of that uses the SEO title Tag data in this way, it means when you add your SEO Title Tag it’s not just used for the hidden title tag, it’s used for internal links, the H1 header on the posts and within important SEO widgets and other SEO features.
Want to see it in action, go to the link above, download the full theme zip files and test it out. If you are a Yoast/All In One SEO user your current SEO data will be used by Stallion Responsive out the box. Really cool set of SEO features, try the Stallion Responsive SEO Posts Widget, the SEO widget is awesome.
David