I think perhaps you are missing the point. If indeed Aquinas did believe that regeneration precedes faith. Then despite the fact the RCC considers him one of their best theologians; never the less he disagrees with the official RCC teaching on the subject.

I doubt Sproul would agree with Aquinas on a lot of subjects. Never the less, on this subject it would seem like Aquinas agreed with Augustine.
As you probably are aware, Augustine is also considered to be one of the RCC best theologians ever; yet the Reformers claim his writings were very influential in their theology.

Again, at this point I have no idea if Sproul was correct about Aquinas view on the subject.

Tom