League of Legends Rune: Greater Quintessence of Scaling Ability Power

Greater Quintessence of Ability Power or Greater Quintessence of Magic Penetration are the way to go. Scaling Runes are always questionable because early game action can be so mandatory. Greater Glyph of Scaling Magic Resist is viable because in an pure AD macthup you won't need MR early on but every damage Rune either attack damage or ability power should be flat imo.

I havn't seen these runes very frequently and I fear they have been written off as useless.
Even though the flat AP quints help you in the early game, the scaling AP could be viable for some midlaners that are not that dependant on early-game AP to bully their lane such as Kayle or Lulu building atack speed early benefitting from hybrid damage for the bully potential.

Keep in mind this is but a theory and if there is an expert mabye he/she could chime in for the viability of these runes?