What say ye?
It depends on the context.
If you are listing the designer for Medinah #1 generally, I'd be fine with Bendelow coming first, and then me. [You're leaving out my associate Brian Schneider, who probably had as much to do with that design as I did; but then we don't know who his counterpart was for Bendelow, either.]
If you were writing a preview for a tournament, though, and you said that the players were matching wits with Bendelow, that would be silly. None of the greens are his, and maybe only a few of the bunkers, not to mention the 2nd, 4th, 5th, 15th, 16th and 17th are not in the same places as they once were.
For Augusta, on the other hand, who are you going to give it to if not MacKenzie? The good Doctor is still the one responsible for its most iconic holes [12, 13, 14] and most of its routing, although they changed the numbers on him. Mr. Jones added enough ponds that he should probably get a mention, and Perry Maxwell, too, for changing the 7th and 10th. But you could never say that either of them had as much influence on the course today as MacKenzie still does.