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jeff sDelehanty and Wright are really popular, particularly Wright because he isn't obtainable in any other major set. I'm sure this has something to do with McPhee's rarity as well, though I suspect that part of the issue with McPhee is that no one collected him for a long time (unlike Delehanty, or any other early HOF inductee). It's worth remembering that aside from a few players, if you decide you want a card of a particular OJ player, it could take a while to find any pose of him. There are usually about 25 old judges for sale on ebay any given week (with some variation), so if you figure that if there are 500 players, it would take a while to find everybody. Compared to <pick your random common>, Duffy, Ewing, Sunday, McCarthy, Brouthers, Ward, Keefe, etc. are really easy to find a single example of.
For what it's worth, I don't think Griffith is all that tough--I've seen at least four for sale in the last eight months--I think Rusie, Connor, and Robinson are tougher. Maybe add Hanlon, Beckley, and Galvin to that list too...they're about the mid-range of HOF difficulty.
Just my opinion...lots of people here know much more than I do...and their expertise extends beyond poor-fair cards