DId they really "improve vastly"? Not claiming either way but I don't recall ever seeing anything special.
And do you know all of that for sure? in the video I posted in the recent thread about TJ it looks like there are a bunch of low/mid level fighters at his gym (or they're so full of themselves they feel like they can give pointers to a profesional kickboxer?)
From what I know he took a mostly Wrestling based team and made them better strikers.
TJ became a champion under him(TAM's first champion), Mendes fought his way back to a second title shot and JoeB did the same. If my time is correct here, Ludwig was with them for most of this, if not all of it.
I remember watching a video about Ludwig saying he doesn't work that much, around 3 hours a day and doesn't really have any interest in taking new fighters under his wing to groom them into champions the way he did with TJ. Actually, I remember now, it was his time on JRE.