To estimate how much losing Messi might hurt, I ran some simulations and compared the expected points for Real Madrid and Barcelona over their next seven matches. … At full strength, Real is favored to take about one more point than Barcelona in the next seven matches — Real has slightly better stats and a slightly easier schedule. If losing Messi makes Barcelona’s attack about 30 percent worse, then the gap jumps to about four points. If Messi makes them 20 percent worse, Real should take about three more points over the next two months, and at 10 percent the gap would be two points.
This helps explain why it is so hard to identify Messi’s value from the time he is off the pitch. Because La Liga is so unequal and Barcelona so good, Barca remains strongly favored in most of its matches even if the club is significantly weakened. The expected point gaps can be measured on the fingers of one hand, even in scenarios where Messi’s effect on his team’s quality is legitimately massive. Unless the loss of Messi causes an unexpected, utter disaster, Barcelona should be easily within striking distance of the title when its superstar returns.