Mo's ultimate winning times don't necessarily prove it was a weak era. There were a number of guys perfectly capable of running in the 12:40s back in early-mid 2010s, as demonstrated by the Paris 2012 5k with *six* going under 12:50 in that single freakish race. Mo was definitely not alone in not wanting to endure that level of suffering, though, and things really do have to line up just the right way for a 5k to end up super hot like that. As others have said, anyone else was free to crank up the pace any time they wanted in Mo's championship races, they just never did.