LEADERS Leinster secured a bonus-point victory at Lanfranchi Stadium. First-half tries by Rob Russell and debutant Andrew Osborne, and further scores in the second by Luke McGrath, Scott Penny and Russell again, kept Leo Cullen’s side top of the standings with six league games remaining. Russell opened the scoring in the fourth minute when he found a gap in the defence from a Liam Turner pass after cute dummy play by Ross Byrne. Geronimo Prisciantelli’s cross-field kick to wing Scott Gregory set up full-back Jacopo Trulla for a Zebre try with with Prisciantelli conv...