OK, mystery solved (somewhat).
I've learned a lesson: "Never trust the memory of old geezers!"
(including me!)
I found one of our Zeta rosters from IHQ printed in 1972, and
it has #1 on it. Apparently he was dropped for some reason
after that...though I can't imagine why.
I was also able to check our "League and Covenant", the
little book that ThKN guys signed during their ritual, which
numbers the initiates. For the most part, the ThKN numbers
don't match their current LXA Zeta numbers. Many of them
are "off by 1", but others are WAY mixed up!
I suppose at the time, during the depression, and then our
chapter was inactive during WW2 (though not officially closed,
like most), alot of records were lost/messed up.
So like most conspiracy theories, "#1 not assigned as
a slight toward Cole" turns out to be incorrect.
But hey, it was fun while it lasted, right??
Thanks for the replies!