Just to throw in 2 cents in a different direction, I think they should dump the whole number retirement thing and perhaps create a recognition criteria for only elite players with longevity, and elite management -- the Mount Rushmore -- Russell, Havlicek, Cowens, Bird, Pierce, Red, maybe Cousy, maybe Tommy, maybe Danny.
The rest should have a place in a Celtics museum -- if they want to call it Hall of Fame I suppose, but better to be a museum of memorabilia, stories, videos, etc. That way Celtics who contributed in small and large ways (including guys like Glen Macdonald and Gerald Henderson and Mike Gorman) are acknowledged without a dividing line that puts a Ray Allen in and leaves a Nate Archibald out.