An excellent, natural open-side who specialises in winning turnover ball on the ground, Barclay was a principal architect of Scotland's shock victory at Croke Park in 2010. If he is allowed to wield his influence at the breakdown, Leinster's task becomes that much harder.
The floppy hair and languid demeanour may suggest a lack of steel but Gray's progress has been one of the big positives in Scottish rugby in recent years. Prominent in the loose, at 6'9", Gray has the height to dominate the line-out and threaten Devin Toner's security on Leinster's throw.
The focal point of Glasgow's play, Cusiter is the controller and tempo-setter at the base of the scrum. Still only 29, the Scotland and Lions international possesses vast experience and a strong all-round game in addition to his natural leadership skills.