Great article. The only thing it seemed to miss is that although "gentleman" seemed to have a strict code of honour, there was very little honourable about them. It was a social tool used by the haves to suppress the have-nots. There are remarkable stories of what gentleman did for "honour" but they are rareities not the rule, and there are just as many stories of people who were not considered gentleman doing the same things.
The main emphasis when someone was described as a gentleman was to convey they were a "better" person. And not by choice but by inherited right. You didn't become a gentleman, you were born a gentleman, and that gave you the right to subjugate others. Hence the reason that allowing yourself to be subjugated was a blemish on your honour. If you weren't born a gentleman, even the most exemplary behaviour wouldn't make you one, or if it did (as Sharpe does in the Bernard Cornwell novels) it was still known you were not a real gentleman.
As someone said above, the Flashman novels are brilliant and fascinating, but there perspective of honour is very different. This is Victorian England we are talking about, a drive towards an ideal of moral purity. When in truth it became a social tool to surpress both the poor, women, and anything that would challenge the status quo. You have to remember that this was also the age of industrialisation, at a time where technology was making new millionaires. No longer was it the simple case of Title=land=money. Now there were richer people who had no land, no title but an awful lot of money. Factories required workers, cheap workers, so woman became income earners, not just assets men kept at home. The fought for a voice and a right to vote. Workers were being made redundant by factories and rioted.
There was no excuse to deny workers their rights, or women the vote, or the new rich a right to enjoy their wealth. Except for one excuse. None of them were "gentleman" or contained "honour". It was the last pathetic excuse of a group of people who through one method or another had held all the power up until then. It's no different from 1950's men saying "women get emotional so are no good at business" or "black people are uneducated therefore can't do the same work as white men". "Gentleman" was the last desparate prop.
I've not played the game but "honour" seems an odd theme to include in the title.