https://www.telegraph.co.uk/rugby-union ... -simmonds/
Loads of pictures and gifs in this article. I will copy the first bit.
What makes Billy Vunipola so valuable to England and he is not in competition with Sam Simmonds anyway
Billy Vunipola amassed 25 tackles against Ireland, forced two turnovers and made more metres than any forward on the pitch
Sam Simmonds is an excellent player. His pantomime shrug at the Twickenham Stoop on Friday evening, in celebration of an electric individual try against Harlequins and presumably referencing his England omission, revealed a sense of humour as well.
But, less than 24 hours later as Ireland were beaten 18-7 on the other side of the A316, Billy Vunipola staged a comprehensive exhibition of what he offers as a Test match number eight.
We are continually told that selection is about balance. In his first three England starts, Simmonds shared a back row with Chris Robshaw plus either Maro Itoje or Courtney Lawes.
In his most international outing, the Exeter Chiefs star was flanked by Robshaw and James Haskell. That day, Ireland overturned England at Twickenham, sealing the 2018 Grand Slam with a 24-15 victory.
Eddie Jones has likened Simmonds to an exciting Twenty20 cricketer. Two years ago, he acknowledged that his team had to “adjust” to playing with him. Part of that adjustment, evidently, is complementing Simmonds with at least one heavy-hitter in the back row. Rob Baxter apparently agrees.
Exeter teammate Dave Ewers, who weighs 125kg, has proven to be an effective foil for Simmonds. The imposing Jannes Kirsten, a rangy lineout jumper, joined those two in Chiefs’ starting back row for the Premiership final and again on Friday night.
Simmonds does not shirk hard graft, but those colleagues bend gain-lines and clear rucks so he is free to do what he does best. Conversely, the presence of Billy Vunipola allows England to team up Tom Curry and Sam Underhill.
At the weekend, Vunipola demonstrated his distinctive traits, and why they are so valuable.
Set-piece responsibilities
Vunipola junior is England’s rock at kick-offs and restarts. Watch how he slips past James Lowe in the opening seconds after gathering Ross Byrne’s kick.
CJ Stander fells him, but loses the collision. In fact, England could have been awarded a penalty for tackler’s inability to roll away immediately. What a tone that would have set:
Vunipola carrying so often in this area of the pitch means that Underhill and Curry can remain on their feet to lead England’s destructive, suffocating kick-chase.
As well as control at the base of scrums, Vunipola is a fine lineout forward. He often adopts the scrum-half role, steering mauls or distributing.
He would have been frustrated that Ireland managed to derail a couple of drives at the weekend, notably this one prior to Jonny May’s first try. It seems to be Vunipola that loses possession about two metres out as Caelan Doris hits the maul: