Yes, and we know already know Rocks already tried to take his spot.
Does it therefore seem pretty telegraphed to you Blackbeard will succeed where Rocks failed?
Catarina touched Saturn, that presumably meant she could assume his appearance and help the BBP infiltrate the Holyland, which may be exactly what is happening right now. It seems likely since Saturn is dead and the window on using his appearance should be closing if it isn't already closed.
I don't think there's any chance Blackbeard doesn't fail in killing Imu for his third and final DF, the "strongest" Zoan to match his "strongest" Logia and Paramecia and secure his position on the Empty Throne.
Oda has built up Blackbeard for decades. His iconic introduction made it clear he was in inextricably linked to Luffy.