A few details/things. Now that SBA has been installed there is an additional option name (ON) type called SBA Select List (Dropdown) Basic that is only needed when a product has a single attribute (SA). The software has three different perspectives with which it deals: a SA for a product (ie. Color only), multiple attributes (MA) like size and color, and an alternate MA situation where each attribute is tracked independently but is offered as a MA grouping (still dependent driven options, but stock availability is based on the most restrictive quantity within the selections made.)
Potteryhouse got SBA to work with a SA and had developed the discussed ON type which was his business need. In that development, an attribute assigned to a product that wasn't tracked by SBA offered the standard dropdown operation. ##Therefore there is no significant "impact" of an ON being assigned to a product that isn't used by SBA.
Dynamic dropdowns (DD) was developed many years ago and while there were some logic issues, it had all of the right "tools" to function as desired/expected. There remain some implementation issues with the current version, mainly the effect of its use when javascript (JS) is ##disabled or as a result of the page pre-install fails validation.
So, when trying to take SBA to the "next step", it was important to maintain potteryhouse's existing capability and incorporate handling/presenting MA selections through DD. Then of course integrating that with installation. The default values are set to support the 3 above arrangements except there is one user action needed to use the SBA Select List (Dropdown) Basic option name type because SBA has not been written to take over dropdowns. It could be done, I just find that such takeover too intrusive when an alternate means is available though it would help to have documentation.
So for the site setup as I see by outside inspection and the code as provided (perhaps someone has done some work in the past to help you use the Dynamic Dropdowns features), is that at least the Dynamic Dropdowns options have been changed to either work for all SBA tracked (1) or for Single-Attribute Only (3). Also that the product info single attribute display plugin is set to single_radioset. My suggestion for maximum use/view of options would be to restore the Enable Dynamic Dropdowns option to 2 (On for Multi-Attribute Only). And then go into the option name manager, select the option name(s) that are used as single attributes on a product and if they are stock related set them to SBA Select List (Dropdown) Basic.
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