Iron Maiden drummer Nicko McBrain says the band had instituted a new rule to address the fact that he can’t play as well as he used to. He suffered a stroke in January 2023 that left him partially paralyzed, although he returned to action after months of intensive physical therapy. After a few dates of their summer tour that year left some fans asking questions, McBrain – now 72 – explained that he’d been left with some limitations in his performing ability, but that he believed he was at 70 percent at the time. READ MORE: Bruce Dickinson Worries Iron Maiden Doesn’t Push Hard Enough “I’ve gott…