Erik
You seem to base your argument on whether the Open or US Open have the strongest fields on the R&A and USGA failing to simply adhere to the World Rankings when deciding their qualification criteria. As Sean has noted, and as much as the WR is a useful tool, it does throw up anomaly's from time to time. For example, who provides greater strength, the player who sits in the lower half of the world's top 100 due to having had a stellar season the year before but has rarely made a cut this year, or the player who is bang on form having made a number of top 10 finishes on some overseas tour ?
Then there are the qualifiers. Yes there may be some who "get lucky" to qualify and there are others who carry that form/luck into the championship and manage to get well up the leader-board, or in the case of Paul Lawrie in the Open and Michael Campbell in the US Open, actually end up winning.
So who out of that lot will add the most strength to the field ? You have your opinions and the R&A etc have there's, and that's all it is, opinions. Just opinions.
Niall