What the heck are you talking about?
It's Ryu-Oh > Cthulhu
Cthulhus C-Frame is shit and Ryu-Ohs attack and def down doesn't miss than Cthulhus.
Cthulhu just offers a shit def c-frame but Ryu-Oh attack and def down + BP.
BP > Orb eating
What you are saying doesn't make any sense.
Just use Ryu-Oh, snipper and Atlanta --> you reach def cap.
You can't do that with Cthulhu unless you run with Gawain or have one SSR/SR with A or B frame.
Furthermore when we get Wolf Maanaf next year, I would immediately bench Cthulhu/Atlanta.
Ryu-Oh + Wolf Maanaf = 50 def down, 20 attack down and BP.
People just wanted Cthulhu because of her C-frame and you can reach def cap.