This isn’t news, but the Cubs have struggled to find a consistent leadoff hitter ever since Dexter Fowler departed via free agency after the 2016 season.
Fowler led off in 146 games in 2015 and provided a .350 OBP. In 2016, he led off in a few less games (118) due to injury, but posted an even better OBP from that spot, .393.
That’s gone seriously downhill over the last two-plus seasons. In 2017 Cubs leadoff hitters posted a .324 OBP. In 2018, a bit better, .366, but so far in 2019 that number has been pretty bad at .