So Satoshi was either multiple people or one clever person who was pretty switched on about OpSec.
Seriously switched on.
I could post "splendid" once in a while, but that doesn't make me based in Britain.
Yeah, all of these are indicators which over time you can collect, and build a profile of the person, and take a educated guess rather than anything concrete. So, while Franky might have been a little too quick to jump to the conclusion, those sayings are very typical of a British person, where as splendid I don't hear very often. Anyway, the indicator can also be inaccurate as it could tell us Satoshi has been infulenced by British culture, not necessarily where they were or currently based. I know Americans, and other nationalities use phrases from different countries just because they are friends or associate with international people.
I am convinced that all these theories will remain just theories and nothing more, in 10 years or 50 years, nothing will change in that regard. The truth that many are looking for will only be found out if Satoshi shows up and unequivocally proves that it is him or them, but even then there can be a suspicion that someone just managed to gain possession of his private data.
Well of course, it's most certainly very difficult to prove, and therefore would forever remain inconclusive. We have had issues in the past with people claiming to be Satoshi, and I believe Satoshi's email address was even compromised, so it indicates that Satoshi may have not had the best security practices in place for certain things. Which is nothing new, I know of security professionals which are very good at their job, but neglect things close to home, and its usually because of the same pit falls other people fall for. Ease of use, and complacency.