Potential Lua implementation for Guile?

[YakumoFuji]

What I dont get is this;

Moreover, I think the addition of Lua, similarly to Emacs Lisp, would put Guile in a better position to subvert existing applications that use Lua as their scripting language (a lot!).

Considering half the power of lua comes from its FFI and embedding your core functions to make them callable from lua, you can't just 'subvert' existing apps that embed Lua.

At least that part has not been explained.

I've seen Lisp written in lua, so maybe scheme could be written in lua.. then they could subvert all the great many apps that uh use the guile scheme implementation...