As someone who has taught leadership within the armed forces for 3 years, I feel I can comment on this subject with some conviction and authority.
You don't have to be edgy or hard nosed to be a good leader, there are different styles of leadership, which different people will respond more or less favourably, depending on their own character.
The key is knowing one's own strengths as a leader and, more vitally, knowing one's audience. That's where true team bonding comes in.
The ideal team will have several leaders of differing styles, eg the England 03 team, with Johnno's glowering menace and Lol's motivational presence to name but 2 examples. Some players would react to Johnno staring and think to themself that they need to up their game, others would be largely oblivious to it, same goes for Lol's pep talks.
Nature V nurture will always be debated, but there is a place for both.
You're almost certainly correct, and I'm happy to defer to your expertise on this front - my comments had a very narrow focus indeed, and pertain specifically to the Launchbury vs. Shields debate.
"Edge" is obviously an abstract and subjective concept here, and for my money it comes in different flavours; Dallaglio and Johnson both had it, insofar as I'm concerned, but it manifested itself differently in each individual.
Launchbury, for all his *many* positive attributes as a player and talisman, doesn't (IMO, of course). Shields, on the other hand, does.
To use an old-school rugby term, I see "edge" as involving knowledge and mastery of the so-called "dark arts."
Launchbury, as lovely a person as he seems to be, strikes me as the kind of guy for whom Dark Arts is a subject taught at Hogwarts
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