I'm saying that that didn't happen with Madigan, he was never worse than 2nd choice 10 past the age of 21. Shaun Berne was second choice up until 2010 and then Mads overtook him, Berquist was brought in and played twice because of Madigan's presence and an injury. Madigan played around the backline a bit yeah but I don't think he ever played a season for Leinster where the majority of his time wasn't at 10, as Snoop alluded to playing under a terrible and restrictive coach in important formative years for a 10 really damaged him but he had plenty of opportunities between 2010 and 2015 to play 10.
I'd also be quick to dispute that he was the problem in 2015 which seems to be the narrative following this Ulster story, he was a drop down from Sexton sure but Payne to Earls, SOB to Henry and POM to Jordi were bigger problems and drop offs that day. If we had a 2014/15 standard Mads right now available to us there'd be no added worries about with a Sexton injury other than losing the best 10 in the world, now it looks like we don't have any other available international class 10's available.