Hot Take inbound:
I don't think Cruz or TJ have amazing footwork; it's just fancy. Footwork can also be seen as being in good position, forcing your opponent to move, etc.
Boxing Legends TV had a great video on this comparing Ali to someone else, I wish I could find it.
As far as who I think has the best footwork in MMA, hard question. McGregor is pretty good, I thought Aldo used to be pretty great; especially the way he defended against wrestlers, Till is looking good from a MT standpoint, Wonderboy has good karate footwork, etc.
That said, I'm not about to argue that Cruz and TJ aren't good at moving their feet. I just don't think it's the best ever seen.