[1] Initially Henderson played as a centre forward, and deputised for Henry White or Andrew Young; he made five appearances in 1921–22, his debut coming against Huddersfield Town on 22 October 1921.
[2] He found first-team opportunities rare with the Gunners; he was moved out on to the right wing in 1922–23 with two appearances, but was unable to supplant long-serving former England international, Jock Rutherford.
Following the transfer of Joe Barratt to Birmingham in March 1922, the "Saints" had tried several players on the right, including Charlie Brown, Robert Blyth and Sammy Meston, none of whom had any conspicuous success.
In the semi-final Tom Parker had a dreadful afternoon, first scoring an own-goal, then suffering a rare miss from the penalty spot (shooting straight at the 'keeper) before a mix-up between him and goalkeeper Tommy Allen gave Sheffield their second goal.
By now, Henderson was developing a useful partnership with Arthur Dominy on his inside, helping Bill Rawlings at centre-forward to continue as the Saints top-scorer for the fifth of six seasons since the club joined the Football League.
[7] In the League, Henderson had his most successful season, now playing with Dick Rowley at inside-right, when he scored six goals (from 38 appearances), including a pair against Middlesbrough in a 2–1 victory on 30 August 1926.