Exeter’s Gareth Steenson on form but 14-man Castres still too strong

• Pool Two: Castres 29-25 Exeter• Exeter Chiefs again struggle in Champions Cup pool stageExeter have never won more than three matches in the Champions Cup pool stage. They will need to win in Munster in January if they are to improve that record, and make the knockout stage, after failing to exploit the dismissal of the Castres No 8 Maama Vaipulu on 36 minutes for a head-high challenge.Vaipulu hit Luke Cowan-Dickie’s jaw with his left shoulder as the Exeter hooker made a supporting run without the ball and became the latest victim in the crackdown on challenges that make contact with an oppo…