I have no direct information about the players, but have the following info to add to the discussion.
The speculation about Claude McLin was started by Bob Porter who refused to believe it was Von. Von says he's not sure but his brother George swears it is him. Somewhere in my collection are some very early Freeman recordings where he sounds nothing like his mature style - he sounds like a Lester Young disciple. After that period, he played alto for a while and sounded like Bird. When he reverted to tenor he sounded like Von Freeman.
Back in the mid-'70s I copied this material from recordings in Von's personal collection.
BTW, Von turned 88 on Sunday - a celebration is taking place tonight at the New Apartment Lounge.