It Seems Like There's Some Confusion Regarding Hideyoshi's Conditions To Show Up... I Haven't Played The DLC Myself, But Japanese Sites Said That To Make Hideyoshi Appear, You Have To Capture An Evolved Nobunaga Without Capturing Tokichiro.
As For The Next Statements Please Be Aware That The Turn Characters Will Show Up Are From The Default Difficulty. Each Difficulty Will Hasten The Turn They Show Up By 10 Turns, Which Means At The Highest Difficulty (5-Star), Invading Characters Will Appear 50 Turns Earlier.
As For How To Evolve Nobunaga, There Are Two Ways.
One Is By First Capturing Takechiyo, Kichou (horse-riding girl), And Ichi. This Will Trigger An Event At Turn 49, Which Would Allow Ranmaru To Attack Your Base From There On. Yasuke Will Also Start Attacking At Turn 63. If You Have Captured Ranmaru And Yasuke, Then Once You Unlocked Nobunaga Saburo, She Will Immediately Evolve And Show Up At Azuchi Castle. On The Other Hand If You're Having A Hard Time Fighting Ranmaru And Yasuke, Delaying Their Invasion By Not Capturing Either Of The 3 Girls I Listed Above Will Be Beneficial For You.
Second Method Is By Capturing Her Normal Form (Saburo) Without (or BEFORE) Fulfilling The Previous Condition (capturing Ranmaru and Yasuke). You Then Need To Breed With Her 3 Times In Which An Event Will Trigger The Next Day Where She Will Escape The Cave. She Will Then Invade Your Cave Starting From Turn 77.
Sorry For The Long Wall Of Text... But I Hope It Helps.