It always seemed highly unlikley to me. I mean, you're palying a game and suddenly one of the participants decides to change the rules and essentially commits a foul. Do you a) congratulate him on inventing a new code or b) kick him square in the pants and throw him out of the game?
You have to keep in mind that the rules of football in those days varied from school to school. At one end of the scale you had schools playing a game that was not too dissimilar to "soccer", and at the other end you had a game that was more akin to "scrag" or "force-back". Sometimes the rules could change on an almost daily basis. By 1841, at Rugby School, running with the ball was officially allowed, although it was likely to get you hurt by players who took exception and considered it
"sharp practice". There were conditions however. A player could only run with the ball if
a) the ball was caught
on the bound, i.e. after it bounced,
b) the catcher was not
"off his own side", i.e. offside
c) that the catcher did not pass the ball but ran on himself
The rules weren't really set down until the middle of the 19th century. What we now know as "Rugby Union" can really be traced to three things that happened over a period of about 25 years
1. The first set of rules
Handwritten in 1845 by W.D. Arnold, W.W. Shirley and F. Hutchins; three senior pupils at Rugby School. On 25 August 1845 they were instructed to "codify the game of Football" and three days later they submitted 37 Rules which were subsequently passed, and a Rule Book was printed.
2. The decision in 1863 by Blackheath FC to leave the Football Association.
The matter of "hacking" had come to a head; the Football Association wanted it made illegal, but Blackheath wanted to retain it and when they got outvoted, they left. Many of the clubs that existed at that time still to this day keep FC (for Football Club) as a part of their name rather than the more commonly used RFC, e.g. Saracens FC, Harlequin FC. This is so even in New Zealand, e.g. Poneke Football Club, one of the older rugby clubs in NZ, established in 1883
3. The formation of the Rugby Football Union in 1871
They refined the Laws, becoming the first to bear at least a passing resemblance to what we call the
Laws of the Game today.
The game was at that time known just as
"Rugby Football" until
"the Great Schism of 1895", which was essentially an argument about professionalism. It resulted in the creation of Rugby League as a seperate football code.