How is Mini-Gnar a unique playstyle?
He plays just like a marksmen.
"Hey well Gnar doesn't really want to use his E if he is going to transform soon and he also wants to set up for an ultimate".
Well why is Mega Gnar specifically labeled as a Vanguard?
"Hey well Gnar doesn't want to use his E to go in if he is going to transform soon and he also wants to set up to kite".
Also how is Jayce an artillery mage? Because he has one long range ability? It isn't as useful in comparison to all other artillery mage abilities if we are talking about range poke/burst. He spends time up close as well and casts a bunch of stuff. I'd put him in skirmisher primary.