Just because don't look the same doesn't mean their tricks aren't similar. Since freehand has been mainstreamed so much more, and especially because all of the names you've mentioned (minus Miguel) regularly collaborate on their tricks, they undoubtedly going to look somewhat similar. That's not even with 5a in particular, that's everybody.
To me, I get kind of annoyed with tech 5a because there is nothing differentiating each besides each mount. I can pinch strings together and hold a yo-yo in place to throw the counterweight for pretty much any mount, and as long as the yo-yo is spinning, I can do it, not much challenge to it other than actually devising which mounts to do it under. And not only does it seem repetitive and easy, there is almost absolutely no flow to it.