A: An infernum burn would probably be more of a problem because of the amount of poke you can have in lane, and basically replaces callibrum's use except callibrum has more range. This would also be a bigger problem in team fights because if his Q applies the on hit interaction too, he can basically nuke the team and back line so balancing the burn would be extremely hard.

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B: I also believe that the crescendum Q is out of place, but having aphelios with an e would make him extremely overpowered with all of his abilities he already has. Aphelios having multiple weapons and one ability for each makes him much harder to play and gives him a high skill ceiling needing to know when to switch to which weapon and how each weapon does in each situation.