I agree with you. Rayo had every opportunity to win the match but they messed up with their beautiful chances of securing three points yesterday from the defending Champions. If Barcelona does not close the laxity in their defense, it will be difficult for them to defend the title because Real Madrid is ahead of them. Barcelona
Real Madrid also lacks sharpness up front, so their attack won't be lethal enough unless they make significant changes to their attack and midfield in the upcoming match. And regarding Rayo, I also saw many opportunities that didn't translate into goals in the match against Barcelona, so the draw was actually due to Rayo not fully capitalizing on their opportunities. Therefore, Barcelona will definitely improve on this in the upcoming match to get back to winning and close the gap to other teams.