4. Alex Corbisiero
https://www.youtube.com/watch?v=RfgxfaazMaw Our trump card here is Alex Coribisiero. Having not played for much of the season, and being left out of the tour to New Zealand to gather some game time, including him in this list may seem a bit presumptuous. Indeed, his replacement, Joe Marler, has performed admirably, and we wouldn't put it past Lancaster to reward his good work with a more permanent position. However, going forward into the World Cup, we believe that, if fully fit, Corbisiero would usurp Marler and retain the position he played with great success during the Lions tour last year. He is surprisingly strong, and by far England's best scrummager, single-handedly imploding the Australian front row, and deserves to be back at his best after a lengthy spell on the sidelines.