I only saw one advocate for 5 iron which would be my choice. I can hit it 200+ on longer shots, choke down for knock down shots and distance control and it is good for greenside chips. The sand seems to be a concern, but if I don't have a good club for the sand, then I am going to avoid it by aiming away, over, or short of any sand. If I am in green side sand, then lay it open and choke down and you can get out. But, I think the added distance would be necessary to score on Par 4's of varying distance.
If a 6,7,8i can get you around a course in par/bogey fashion, why do we higher handicappers insist on using a 14 club bag?