I don’t think healers are necessary on defence personally. That’s just my opinion.
All my defences I have tried work better with another hero in the place of a healer… Healers are too situational & the AI sucks at situational. Additionally, in my own offence raids, healers don’t stand out as having caused any issues for me personally.
Much of the positioning is for lack of a better option if that makes sense?
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Is Wilbur an ideal flank? No… Is there a better Red flank? also no.
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Is Quintus a fantastic hero? No. Is Quintus a better hero than Obakan (your other purple 5* option)? Yes absolutely IMO.
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Is Zocc great on defence? Not really. Could use a largely emblemed Caedmon or Melendor if you wished.
In the end, early & midgame defence teams is more about setting the best you’re able to… not the best ever.
End game it becomes more about choosing the best option you have but that comes with time & depth.