In "The Empire Strikes Back," Yoda says to Kenobi, “No. There is another.” This brief moment has always resonated because it shows that all along, Yoda has always had a "B Plan" in place in case Luke followed in Daddy's footsteps. There is another Skywalker. Leia.
Remember, according to Yoda, Luke was reckless. Always daydreaming; looking away to the future and never had his mind on what he was doing or where he was. So, I wonder, was Yoda watching Leia all this time too? Watching her become a strong leader. Smart with the ability to strategize and make tough choices during a crisis.
Thinking of the tie-in with "Rogue One" to "A New Hope," Leia succeeded in bringing Hope (the Death Star plans to the Alliance). Perhaps Yoda was thinking: Leia should've been Plan A? Or, was he saving the best for last?