So is Pantheon supposed to be a new class of champion?

There's early game champions, such as . We already know what these guys do. They roll you early to get a snowball lead then proceed to carry that lead throughout the game until late game, which is when they fall off and don't do as much damage as some other hyper scaling champions. Now was always a early game focused champion, such as the ones listed above, but that seems to have changed dramatically with the rework. Early game is where he falls off. You see, there's a window of about 5 minutes as Pantheon when you are actually a threat to the opposing team. After that time is up, you are just a super minion or a CC bot. This is why people are playing him support. Is this intentional or what? Even if gets a snowball lead early, he cannot really carry it whatsoever into the mid game and beyond. It just feels like he falls off FAR too early for even what a early-game focused champion should.