I also loved Joe Allen...he was an extremely personable guy who I also met in the 1960's and as you watched him play you wondered how he got it done...
Maybe that was part of his advantage -- that opponents might snicker and think that this guy is half crippled with that brace on and he barely jumps -- then Joe would go to work and embarrass bigger, quicker guys.
There was one impressive component of Joe's game and that was the way he could use his butt as a tremendous offensive weapon -- gaining him great position and displacing opponents. It was almost as if his wide posterior had its own brain and worked independently...
BTW -- Joe also had a long, fine career playing pro ball in Italy back when European basketball never got a bit of press anywhere.
I actually own the only basketball card of Joe that was produced during his playing time (there are others produced later by Bradley that were game souveniers) and it depicts Joe in his bright gold Italian team uniform with his memorable huge smile.