7 Starly Less Flair But More Durability This Starly is a downgrade from the one introduced in Space-Time Smackdown
I think part of it is TCGPlayer factoring in availability, I know Radiant Greninja is available in two sealed products (the Origin Forme Palkia VSTAR League Battle Deck and the Quaquaval ex Deluxe Battle Deck) and Astral Radiance packs while the version of Radiant Charizard reprinted in the Prize Packs is only available in Crown Zenith
The exact contents are unknown until the pack is opened, which is what creates the excitement and the uncertainty
For Rocky Helmet, the opponent would have to think very carefully if getting some early attacks would be worth putting their currently active Pokmon into one-hit knockout (OHKO) range, thus denying an easy way of just attacking your currently active Pokmon
Zoomed in as above however, it seems as if parts of the stamp are simply not printed properly
For most casual players, there are much better ways to ensure you can make two creatures temporarily bigger in mono-white