On a minor note, AFAIK you can't get 6300 champion shards before level 30.

This is the pre-30 earnings chart, taken from a red post somewhere.

https://i.imgur.com/SWsjH5M.png

At every listed level, you're guaranteed drops equal to the indicated essence value. For reference, a champion shard costs 60% of its BE value to unlock, and gives 20% of its value when disenchanted.

6300 champion shards are worth 1260 essence, so as far as I can tell you can't get one until level 30 at least. Level 5 gives a shard plus enough essence to unlock said shard, so it can't give a 6300 shard since they cost 3780 essence to unlock.

The 6300 tier has the second most champions in the game, behind the massively bloated 4800 tier (there are more 4800s than 1350s and 3150s combined).

I guess you could argue that newer champions are more 'complex', but our old 450 friend Ryze is probably more complex than half the 6300 champions.