Why wasn't the information about Mahrez's first appearance being on the date stated removed when it was added then, back at the start of September. The only addition to that section I made today was with regards to him scoring against Burnley which is correct and sourced, why delete the unsourced information but keep the sourced information. As an another point however, if you go to the Refernces section of Mahrez' page, the final one (number 15) links to Soccerbase (reliable source) that does indeed state the Mahrez' first appearence did indeed come on the day previously stated.