You're both right - an utterly preposterous thought process and I apologise unreservedly; it was against Ireland, not Wales:
Joseph kicks the ball on England's 22; Brown and Nowell pretty level on his shoulder; Youngs out of shot and fairly well behind the ball.
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18m later Brown is categorically ahead of Nowell, Youngs has caught them both; Farrell is up with them (was offside in the first frame); Robshaw is starting to drop away.
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10m on and the distance between them has changed minimally - when placing the ovals, I did have to separate Nowell a little further than Brown & Youngs, but that could easily be camera angle. JJ has overtaken Robshaw.
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Irish 10m line; Nowell has dropped back further; his pace much of a muchness with Farrell - incidentally, the ball is passed the Irish 22; and they're all still flat out. JJ closing a little; Robshaw dropping to the edge of shot.
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Irish 22m line; Youngs comfortably ahead of all of them, Farrell and Nowell still neck and neck; ball still not fielded yet [is 5m ahead of Irish FB], but I'll allow that the breaks have started to be applied. out of shot - JJ has faded slower and towards the touch line to cover a scrambled clearance.
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My apologies for taking my time to put it together - I'd though it was against Wales; so watched through that match (fast forwarding on Youtube is a right pain in the arse) - then the same with the France match; then the Ireland one until I found the event. It was also over a longer distance than my memory from 3 months ago claimed - snapshots taking place over 18; 10; 10 & 18 metres; I will also note that Brown had a touch more momentum as of the first pic; though not that much (IMO).
I presented 1 recollection; and specified it for anyone to check against their memory, or recordings if they could be bothered. I didn't claim it as an absolute and everyone must be wrong because I said it - that's what's been claimed against me. My recollection was wrongly placed; but broadly accurate in its content. Everything else in my original post was given and presented as opinion; my follow-up post continued in that theme.
At worst; you could say that my memory was faulty - at no stage did I present an opinion as a fact, or rubbish someone else's opinion, or them selves for holding said opinion. I certainly don't regard holding an opinion that a very fast SH is faster than a mediocre paced FB or fairly slow winger is extra-ordinary enough to require an extra-ordinary amount of proof, rather than just chalking it down to a matter of opinion and acknowledging that different people are allowed different opinions.
ETA: Oh, I can also be accused of hyperbole - but hey, this is the internet, and everyone does it; I freely admitted as much earlier. I'd also claim mitigation here that camera angles do exacerbate the extra speed of Brown and Youngs; though they still cover more ground in the same time, going by pitch markings - would account for some of the hyperbole.