I have Darth Maul, his lightsabers are smaller than 5mm, maybe 4mm, so they're loose when a CW deluxe toy weilds them. And his hand holes are also smaller, again maybe 4mm. CW weapons don't fit at all. I have TIE Bomber Vader in storage, I'll see if I can dig him up
I have ten Star Wars crossovers on my shelf. The 5mm hands are too big for the lightsabers, they fall right through. The only figures I found that can hold the lightsabers are some of the smaller Prime figures like UltraMagnus, Megatron, and Bumblebee. Sadly Optimus can't hold them. There are a few movie deluxe figures that can hold them but it is spotty and is more of a friction hold. Masterpiece figures can hold the sabers, but they look ridiculous since they are too small for the Masterpiece scale.